參數資料
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： 30/115頁
文件大?。?/td> 846K
代理商： ALPHA 21164
30
Pinout and Signal Descriptions
21164 Signal Names and Functions
st_clk1_h
O
1
STRAM clock. Clock for synchronously timed RAMs
(STRAMs). For Bcache, this signal is synchronous with
index_h<25:4>
during private read and write operations, and
with
sys_clk_out1_h,l
during read and fill operations.
BC_CONTROL<26> must be set to use this.
st_clk2_h
O
1
This signal is a duplicate of
st_clk1_h
, increasing the fanout
capability of the signal.
system_lock_flag_h
I
1
System lock flag. During fills, the 21164 logically ANDs the
value of the system copy with its own copy to produce the true
value of the lock flag.
sys_clk_out1_h
sys_clk_out1_l
O
O
1
1
System clock outputs. Programmable system clock
(
cpu_clk_out_h
divided by a value of 3 to 15) is used for
board-level cache and system logic.
sys_clk_out2_h
sys_clk_out2_l
O
O
1
1
System clock outputs. A version of
sys_clk_out1_h,l
delayed
by a programmable amount from 0 to 7 CPU cycles.
sys_mch_chk_irq_h
I
1
System machine check interrupt request. This signal has multi-
ple modes of operation. During initialization, it is used to set
up
sys_clk_out2_h,l
delay. During normal operation, it is used
to signal a machine interrupt check request.
sys_reset_l
I
1
System reset. This signal protects the 21164 from damage dur-
ing initial power-up. It must be asserted until
dc_ok_h
is
asserted. After that, it is deasserted and the 21164 begins its
reset sequence.
tag_ctl_par_h
B
1
Tag control parity. This signal indicates odd parity for
tag_valid_h, tag_shared_h,
and
tag_dirty_h
. During fills, the
system should drive the correct parity based on the state of the
valid, shared, and dirty bits.
tag_data_h<38:20>
B
19
Bcache tag data bits. This bit range supports 1MB to 64MB
Bcaches.
tag_data_par_h
B
1
Tag data parity bit. This signal indicates odd parity for
tag_data_h<38:20>
.
tag_dirty_h
B
1
Tag dirty state bit. During fills, the system should assert this
signal if the 21164 request is a READ MISS MOD, and the
shared bit is not asserted.
Table 2 21164 Signal Descriptions
(Sheet 11 of 12)
Signal
Type Count Description
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