Preliminary Information
AMD Athlon™ XP Processor Model 10 Data Sheet | 26237C— May 2003 |
INTR Pin | INTR is an input from the system that causes the processor to |
| start an interrupt acknowledge transaction that fetches the |
| interrupt vector and starts execution at that location. |
JTAG Pins | TCK, TMS, TDI, TRST#, and TDO are the JTAG interface. |
| Connect these pins directly to the motherboard debug connector. |
| Pull TDI, TCK, TMS, and TRST# up to VCC_CORE with pullup |
| resistors. |
K7CLKOUT and | K7CLKOUT and K7CLKOUT# are each run for two to three |
K7CLKOUT# Pins | inches and then terminated with a resistor pair: 100 ohms to |
| VCC_CORE and 100 ohms to VSS. The effective termination |
| resistance and voltage are 50 ohms and VCC_CORE /2. |
Key Pins | These 16 locations are for processor type keying for forwards and |
| backwards compatibility (G7, G9, G15, G17, G23, G25, N7, Q7, Y7, |
| AA7, AG7, AG9, AG15, AG17, AG27, and AG29). Motherboard |
| designers should treat key pins like NC (No Connect) pins. A |
| socket designer has the option of creating a top mold piece that |
| allows PGA key pins only where designated. However, sockets |
| that populate all 16 key pins must be allowed, so the motherboard |
| must always provide for pins at all key pin locations. |
| See “NC Pins“ for more information. |
NC Pins | The motherboard should provide a plated hole for an NC pin. The |
| pin hole should not be electrically connected to anything. |
NMI Pin | NMI is an input from the system that causes a |
| interrupt. |
PGA Orientation Pins | No pin is present at pin locations A1 and AN1. Motherboard |
| designers should not allow for a PGA socket pin at these |
| locations. |
| For more information, see the AMD Athlon™ |
| Motherboard Design Guide, order# 24363. |
PLL Bypass and Test | PLLTEST#, PLLBYPASS#, PLLMON1, PLLMON2, |
Pins | PLLBYPASSCLK, and PLLBYPASSCLK# are the PLL bypass and |
| test interface. This interface is tied disabled on the motherboard. |
| All six pin signals are routed to the debug connector. All four |
| processor inputs (PLLTEST#, PLLBYPASS#, PLLMON1, and |
| PLLMON2) are tied to VCC_CORE with pullup resistors. |
PWROK Pin | The PWROK input to the processor must not be asserted until |
| all voltage planes in the system are within specification and all |
| system clocks are running within specification. |
| For more information, Chapter 9, “Signal and |
| Requirements” on page 43. |
76 | Pin Descriptions | Chapter 11 |