參數(shù)資料
型號: Alpha 21164
廠商: SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述: Alpha Microprocessor(64位微處理器)
中文描述: 阿爾法微處理器(64位微處理器)
文件頁數(shù): 42/115頁
文件大?。?/td> 846K
代理商: ALPHA 21164
42
21164 Microprocessor Functional Overview
System Interface
Figure 10 21164 System Interface Signals
The system interface is under the control of the cache control and bus interface unit
(CBU). The system interface is a 128-bit bidirectional data bus. The cycle time of the
system interface is programmable to speeds of one-third to one-fifteenth the CPU
cycle time. All system interface signals are driven or sampled by the 21164 on the
rising edge of
sys_clk_out1_h
.
5.3.1 Commands and Addresses
The 21164 can take up to two commands from the system at a time. The bus inter-
face buffer can hold one or two misses and one or two Scache victim addresses at a
time. A miss occurs when the 21164 searches its caches but does not find the
addressed block. The 21164 can queue two misses to the system. An Scache victim
occurs when the 21164 deallocates a dirty block from the Scache.
The system requests the misses, and the victims arbitrate for the Bcache.
The highest priority for the Bcache is data movement for the system, which
includes fill, read dirty data, invalidate, and set shared activities.
If there are no system requests for the Bcache, then a 21164 command is
selected.
21164
data_bus_req_h
dack_h
cfail_h
addr_bus_req_h
cack_h
addr_h<39:4>
addr_cmd_par_h
fill_h
shared_h
idle_bc_h
fill_nocheck_h
fill_error_h
fill_id_h
system_lock_flag_h
addr_res_h<2:0>
cmd_h<3:0>
data_h<127:0>
data_check_h<15:0>
int4_valid_h<3:0>
scache_set_h<1:0>
victim_pending_h
LJ-05384.AI4
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