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AN1217 APPLICATION NOTE
Migrating from STPC Consumer-S to STPC Consumer-II
BY T. SEIGNEURIE AND J.M. HERVE
1.
Overview.
This document describes how to design for the STPC Consumer-S in a way that it can be replaced by the STPC Consumer-II once silicon becomes available. All information is extracted from the STPC Consumer-S and STPC Consumer-II datasheets.
2.
2.1
Differences between the two devices.
Functional difference.
The STPC Consumer-II is the 0.25m version of the STPC Consumer-S which is based on 0.35m technology with the resulting advantages in speed and power consumption. As a result, the list of functionnal differences between the 2 devices is very limited. Improved features: - The STPC Consumer-II supports 64-Mbit and 128-Mbit SDRAM devices. New features: - JTAG. - Synchronisation of the CRTC on an external video signal. - Color_Compare output signal, coming from the picture-in-picture block. The two devices have also some differences in term of strap options, and VGA RAMDAC reference current.
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2.2
Pinout differences.
TABLE 1. Pinout differences Ball
G3 N1 W1 AC2 G26 A20 C15 AD9 AF10 E26 D18 A16 B11 B9 AF8 AD12 E25 G24 F26 F25 AC17 AC15 AD13 D11 L23 T4 AC6
STPC Consumer-S
NC NC NC NC NC NC NC VDD_DAC2 VSS_DAC2 VSS_DLL VDD5 VDD5 VDD5 VDD5 3.3V 3.3V VSS_DLL 3.3V 3.3V 3.3V 3.3V 3.3V 3.3V 3.3V 3.3V 3.3V 3.3V
STPCConsumer-II
TCLK TMS TDI TDO Hi-Z / PA[22] Hi-Z / PA[23] COL_SEL NC NC NC NC NC NC NC 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V
Comment
JTAG JTAG JTAG JTAG ISA / Local Bus ISA / Local Bus Color_Compare Output
5V Power Supply for PCI pads 5V Power Supply for PCI pads 5V Power Supply for PCI pads 5V Power Supply for PCI pads VDD_DAC1 VDDA_TV 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 two categories: The new ones, and the ones with a potentially different configuration. TABLE 2. New strap options Signals
MD[1] MD[3:2] MD[4] MD[5] MD[6] MD[7] MD[13:10] MD[14]
Consumer-II
DACs test mode HCLK PLL Speed PCI_CLKO divisor HCLK synchro PCI_CLK PLL speed PCI_CLK PLL speed PCI_CLK deskew CPU CLK : x2/x4
Comment
Pull-Up 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 Pull-Up
TABLE 3. Strap options with potentially different configuration Signals
MD[26:24] MD[30:27] MD[35:31] MD[43:41] MD[46:45]
Consumer-II
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)
2.4
VGA RAMDAC differences.
Migrating from the STPC Consumer-S to the STPC Consumer-II, the resistor on RSET pin becomes 147 Ohms 1% instead of 540 Ohms 1%.
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3.
3.1
Solution.
2.5V Power Pins.
In the consumer-II 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 (Consumer-II) 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 Consumer-II configuration can be left routed. The result is summarized in the following table: TABLE 4. Untouched signals Ball
G3 N1 W1 AC2 G26 A20 C15 AD9 AF10 E26 D18, A16, B11, B9
Signal
TCLK TMS TDI TDO Hi-Z / PA[22] Hi-Z / PA[23] COL_SEL VDD_DAC2 VSS_DAC2 VSS_DLL VDD5
Comment
JTAG JTAG JTAG JTAG ISA / Local Bus ISA / Local Bus Color_Compare Output
5V Power Supply for PCI pads
3.3
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 values should remmain easy to modify. This can be achieved by using 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 1217
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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