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AN1218 APPLICATION NOTE
Prototyping with STPC Consumer-S for STPC Elite production
BY T. SEIGNEURIE AND J.M. HERVE
1.
Overview.
This document describes how to design for the STPC Elite in a way that it can be prototyped by the STPC Consumer-S. The purpose is to start a STPC Elite design prior to silicon availability. All information is extracted from the STPC Consumer-S and STPC Elite datasheets.
2.
2.1
Differences between the two devices.
Functional difference.
The STPC Elite can be described as a graphics-less and video-less version of the STPC Consumer-S. As a result, the list of functionnal differences between the 2 devices is relatively simple. Improved features: - The STPC Elite supports 64-Mbit and 128-Mbit SDRAM devices. New features: - JTAG. - 16 General Purpose I/Os. - 24MHz DEV_CLK is now a General Purpose programmable Clock (ball H24). Removed features: - All graphics and video related features.
The STPC Elite is manufactured in 0.25m technology with all the corresponding advantages: speed, power consumption.
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2.2
Pinout differences.
TABLE 1. Pinout differences Ball
G3 N1 W1 AC2 G26 A20 AE5 AC5 AD5 AF5 AE6 AC7 AD6 AF6 AE7 AF7 AD7 AD8 AE9 AF9 AE10 AD9 AF10 E26 D18 A16 B11 B9 AF8 AC9 AC10 AD10 AC12 AD12
STPC Consumer-S
NC NC NC NC NC NC HSYNC VSYNC VIN[0] VIN[2] VIN[3] VIN[4] VIN[5] VIN[6] VIN[7] VIN[1] COMP BLUE GREEN RED RSET VDD_DAC2 VSS_DAC2 VSS_DLL VDD5 VDD5 VDD5 VDD5 VDD_DAC1 VSS_DAC1 VREF_DAC RED_TV ODD_EVEN# VDDA_TV
STPC Elite
TCLK TMS TDI TDO Hi-Z / PA[22] Hi-Z / PA[23] GPIO[0] GPIO[1] GPIO[2] GPIO[3] GPIO[4] GPIO[5] GPIO[6] GPIO[7] GPIO[8] GPIO[9] GPIO[10] GPIO[11] GPIO[12] GPIO[13] GPIO[14] GPIO[15] NC NC NC NC NC NC NC NC NC NC NC NC
Comment
JTAG JTAG JTAG JTAG ISA / Local Bus ISA / Local Bus
5V Power Supply for PCI pads 5V Power Supply for PCI pads 5V Power Supply for PCI pads 5V Power Supply for PCI pads
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Ball
AE12 AF12 AE13 AF13 AC14 AD11 AE11 AF11 AE14 AF14 AE15 E25 G24 F26 F25 AC17 AC15 AD13 D11 L23 T4 AC6
STPC Consumer-S
BLUE_TV VREF1_TV VCS VSSA_TV VREF2_TV DCLK IREF1_TV GREEN_TV IREF2_TV CVBS VCLK VSS_DLL 3.3V 3.3V 3.3V 3.3V 3.3V 3.3V 3.3V 3.3V 3.3V 3.3V
STPC Elite
NC NC NC NC NC NC NC NC NC NC NC 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V NC 2.5V 2.5V 2.5V 2.5V
Comment
VSS_DLL is connected to GND VDD_CPUCLK_PLL VDD_HCLK_PLL VDD_DEVCLK_PLL VDD_MCLKI_PLL VDD_MCLKO_PLL VDD_DCLK_PLL Core Power Supply Core Power Supply Core Power Supply Core Power Supply
The Not Connected pins (NC) are not bonded to the die and can be left routed to the signal for the other configuration. The PA signals of the local bus are in Tri-State when the STPC is in ISA bus mode.
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2.3
Strap Option differences.
Basically, the strap option differences can be divided in three categories: The new ones, the ones with a different definition, and the ones with a potentially different configuration. TABLE 2. New strap options Signals
MD[3:2] MD[4] MD[5] MD[6] MD[7] MD[13:10]
Elite
HCLK PLL Speed PCI_CLKO divisor HCLK synchro PCI_CLK PLL speed PCI_CLK PLL speed PCI_CLK deskew
Comment
Extends MD[26:24] to improve HCLK speed selection Extends MD[17] to improve PCI_CLKO speed selection Pull-Up if HCLK = MCLK, Pull-Down otherwise Pull-Down if PCI_CLK < 32MHz, otherwise Pull-Up Pull-Down Value not finalized yet
TABLE 3. Reallocated strap options Signals
MD[20]
Elite
CPU CLK multiplier
Consumer-S
DCLK direction
Comment
Pull-Up in both cases
TABLE 4. Strap options with potentially different configuration Signals
MD[26:24] MD[30:27] MD[35:31] MD[43:41] MD[46:45]
Elite
HCLK PLL Speed HCLK Delay HCLK Skew CPU DLL TIC Value HCLK mode
Comment
Value changed due to MD[3:2] extending HCLK speed selection Value not finalized yet Value not finalized yet Value not finalized yet Value not finalized yet (Pull Up by default)
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3.
3.1
Solution.
2.5V Power Pins.
In the STPC Elite a certain number of balls are powered with 2.5V supply and not 3.3V. These must be connected to a 2.5V supply which can be located on the same plane as the 3.3V supply. The VSS_DLL ball (E25) needs to be connected to ground (Consumer-S) or to the 2.5V power plane (Elite) using a null resistor, a solder drop, or any equivalent method.
3.2
Not Connected balls.
All the balls which are Not Connected in STPC Consumer-S or STPC Elite configuration can be left routed. The target being to use the STPC Elite for the final board, all the graphics/video signals of the STPC Consumer-S are either not connected (outputs and analog inputs), either connected to Ground (power supplies). The result is summarized in the following table: TABLE 5. Untouched signals Ball
G3 N1 W1 AC2 G26 A20 AF10 E26 D18, A16, B11, B9 AF8 AC9 AD12 AF13 AD13
Signal
TCLK TMS TDI TDO Hi-Z / PA[22] Hi-Z / PA[23] VSS_DAC2 VSS_DLL VDD5 VDD_DAC1 VSS_DAC1 VDDA_TV VSSA_TV VDD_DCLK_PLL
Comment
JTAG JTAG JTAG JTAG ISA / Local Bus ISA / Local Bus GND GND 5V Power Supply for PCI pads GND GND GND GND GND
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3.3
GPIO signals.
The only features of the STPC Elite which can not be tested with the STPC Consumer-S are the 16 General Purpose I/O Signals. These GPIOs need to be carrefully connected on board due to their functionnality in the case of the STPC Consumer-S: - GPIO[1:0] correspond to TTL outputs. - GPIO[9:2] correspond to TTL inputs. - GPIO[14:10] correspond to analog signals. - GPIO[15] corresponds to a power supply. When the STPC Consumer-S is mounted, the TTL inputs can be left routed according to the STPC Elite configuration, the TTL outputs could be left connected but their behaviour must not create conflicts, and all the other signals must be connected as described in the table. TABLE 6. New functions. STPC Elite
GPIO[0] GPIO[1] GPIO[2] GPIO[3] GPIO[4] GPIO[5] GPIO[6] GPIO[7] GPIO[8] GPIO[9] GPIO[10] GPIO[11] GPIO[12] GPIO[13] GPIO[14] GPIO[15]
Connection
Design dependent Design dependent Design dependent Design dependent Design dependent Design dependent Design dependent Design dependent Design dependent Design dependent Design dependent Design dependent Design dependent Design dependent Design dependent Design dependent
Connecting the STPC Consumer-S
HSYNC VSYNC VIN[0] VIN[2] VIN[3] VIN[4] VIN[5] VIN[6] VIN[7] VIN[1] COMP BLUE GREEN RED RSET VDD_DAC2 Pull-Up or Pull-Down Pull-Up or Pull-Down Pull-Up or Pull-Down Pull-Up or Pull-Down Pull-Up or Pull-Down Pull-Up or Pull-Down Pull-Up or Pull-Down Pull-Up or Pull-Down Leave unconnected Leave unconnected Leave unconnected Leave unconnected Leave unconnected GND
3.4
Strap options.
The new strap options can be implemented for the STPC Consumer-S, this does not affect the behaviour of the device. The strap options with different value should remain easy to modify. This can be achieved by adding a dummy resistor in the schematics and doing the final choice during the assembly of the board.
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4.
Technical Support
STMicroelectronics is on the Internet with a worldwide web (WWW) site on which product presentation, technical literature as well as product support information can be found. A dedicated STPC section is available providing up to date hardware documentation and software tools. The Web address is:
WWW : http://www.st.com/stpc
5.
Update History for Application Note AN XXXX
This is the first issue.
Page Section Change Text
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Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. (c) 2000 STMicroelectronics - All Rights Reserved The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands - Singapore Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
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