Intel AT80604004881AA User Manual
Electrical Specifications
22
Intel® Xeon® Processor 7500 Datasheet, Volume 1
2.3
Signal Groups
The signals are grouped by buffer type and similar characteristics, as listed in
. The buffer type indicates which signaling technology and specifications apply
to the signals. All the differential signals have On Die Termination (ODT) resistors.
There are some signals that do not have ODT and need to be terminated on the board.
The signals which have ODT are listed in
There are some signals that do not have ODT and need to be terminated on the board.
The signals which have ODT are listed in
Table 2-3.
Signal Groups (Sheet 1 of 2)
Signal Group
Type
Signals
1
System Reference Clock
Differential
Differential Pair, HSTL
SYSCLK_DP, SYSCLK_DN, SYSCLK_LAI_N,
SYSCLK_LAI
Intel® QPI Interface Signal Groups
Differential
SCiD 2 Input
QPI[3:0]_DRX_D[n/p][19:0],
QPI[3:0]_CLKRX_D[p/n]
Differential
SCiD 2 Output
QPI[3:0]_DTX_D[n/p][19:0],
QPI[3:0]_CLKTX_D[p/n]
Intel
®
SMI Signals
Differential
Inputs
FBD0NBICLK[A/B][P/N]0
FBD1NBICLK[C/D][P/N]0
FBD1NBICLK[C/D][P/N]0
Differential
Output
FBD0SBOCLK[A/B][P/N]0
FBD1SBOCLK[C/D][P/N]0
FBD1SBOCLK[C/D][P/N]0
Differential
Input
FBD0NBI[A/B][P/N][13:0]
FBD1NBI[C/D][P/N][13:0]
FBD1NBI[C/D][P/N][13:0]
Differential
Output
FBD0SBO[A/B][P/N][10:0], FBD1SBO[C/D][P/
N][10:0]
TAP
Single ended
GTL
TCK, TDI,TMS, TRST_N
Single ended
GTL-Open Drain
TDO
PECI
Single ended
CMOS
PECI
SMBus
Single ended
CMOS
SMBCLK, SMBDAT, SM_WP
SPD Bus
Single ended
CMOS I/OD
SPDCLK, SPDDAT
Strap Pins
Single ended
GTL
BOOTMODE[1:0]
Single ended
CMOS
SKTID[2:0]
Flash ROM Port
Single ended
GTL - OD
FLASHROM_CFG[2:0], FLASHROM_DATI
FLASHROM_CS[3:0]_N, FLASHROM_CLK,
FLASHROM_CS[3:0]_N, FLASHROM_CLK,
FLASHROM_DATO, FLASHROM_WP_N
ERROR Bus
Single ended
GTL Input, GTL Open Drain
Output
ERROR[0]_N, ERROR[1]_N