Service manual

1-70 AlphaServer GS80/160/320 Service Manual
1.16 Directory Module
The directory module uses DIMMs populated with SDRAMs to track
ownership and state of memory addresses local to a QBB. A directory
module is necessary in each QBB in systems with more than one.
Figure 1– 31 Directory Module Block Diagram
DIMM
Clock
Micro
DIMM 0
DIMM 7
DMD
DMA
bus_sel<3:0>
bus_valid
test_mode<1:0>, test_sel
unc_err
cor_err
csr_bus<16:0>
EDC_sub
same_bank_vic
row_par
col_par
rctc_suc<3:0>
owner_id<5:0>
test_mas<7:0>
unc_err
lctd_suc
csr
_
data
ArbBus
D_status<1:0
>
PK1514-99