Dual-Data Rate Ssram Tag Pin Usage - Compaq EV68A Hardware Reference Manual

Dual-Data Rate SSRAMs
Table E–4 Dual-Data Rate SSRAM Data Pin Usage (Continued)
21264/EV68A Signal Name or Board
Connection
From board, pulled up to VDD
From board, pulled up to VDD
Unconnected or pulled down to VSS
BcDataOE_L
From board, pulled down to VSS
Tag Pin Usage
Unused Bcache tag pins should be pulled to ground through a 200-ohm resister.
Table E–5 Dual-Data Rate SSRAM Tag Pin Usage
21264/EV68A Signal Name or Board
Connection
BcAdd_H[23:6]
BcTag_H[33:20]
BcTagOE_L
BcTagWr_L
From board, pulled up to VDD
From board, pulled down to VSS
BcTagInClk_H
BcTagOutClk_H
BcTagOutClk_L
Set from board to 1/2 core voltage
Set from board (implementation-dependent)
BcTagValid_H
BcTagDirty_H
BcTagShared_H
BcTagParity_H
Unconnected or terminated
From board, pulled up to VDD
Unconnected
From board, pulled up to VDD
From board, pulled up to VDD
21264/EV68A-to-Bcache Pin Interface
E–4
Dual-Data Rate SSRAM Data Pin Name
TMS_H
TDI_H
TRST_L
OE_L (G_L)
SD/DD_L (B3)
Dual-Data Rate SSRAM Tag Pin Name
SA_H[17:0]
DQx
LD_L (B1)
R/W_L (B2)
LBO_L
Q_L
SA[19:18]
CQ_H
CK_H
CK_L
VREF1_H
VREF2_H
ZQ_H
DQx
DQx
DQx
DQx
CQ_L
TCK_H
TDO_H
TMS_H
TDI_H
21264/EV68A Hardware Reference Manual