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): 25/115頁
文件大小: 846K
代理商: ALPHA 21164
Pinout and Signal Descriptions
25
21164 Signal Names and Functions
data_check_h<15:0>
B
16
Data check. These signals set even byte parity or INT8 ECC
for the current data cycle.
data_ram_oe_h
O
1
Data RAM output enable. This signal is asserted for Bcache
read operations.
data_ram_we_h
O
1
Data RAM write-enable. This signal is asserted for any Bcache
write operation.
dc_ok_h
I
1
DC voltage OK. Must be deasserted until dc voltage reaches
proper operating level. After that,
dc_ok_h
is asserted.
fill_h
I
1
Fill warning. If the 21164 samples this signal asserted on the
rising edge of sysclk
n
, then the 21164 provides the address
indicated by
fill_id_h
to the Bcache on the rising edge of
sysclk
n
+1. The Bcache begins to write in that sysclk. At the
end of sysclk
n
+1, the 21164 waits for the next sysclk and then
begins the write operation again if
dack_h
is not asserted.
fill_error_h
I
1
Fill error. If this signal is asserted during a fill from memory, it
indicates to the 21164 that the system has detected an invalid
address or hard error. The system still provides an apparently
normal read sequence with correct ECC/parity though the data
is not valid. The 21164 traps to the machine check (MCHK)
PALcode entry point and indicates a serious hardware error.
fill_error_h
should be asserted when the data is returned. Each
assertion produces a MCHK trap.
fill_id_h
I
1
Fill identification. Asserted with
fill_h
to indicate which regis-
ter is used. The 21164 supports two outstanding load instruc-
tions. If this signal is asserted when the 21164 samples
fill_h
asserted, then the 21164 provides the address from miss regis-
ter 1. If it is deasserted, then the address in miss register 0 is
used for the read operation.
fill_nocheck_h
I
1
Fill checking off. If this signal is asserted, then the 21164 does
not check the parity or ECC for the current data cycle on a fill.
idle_bc_h
I
1
Idle Bcache. When asserted, the 21164 finishes the current
Bcache read or write operation but does not start a new read or
write operation until the signal is deasserted. The system inter-
face must assert this signal in time to idle the Bcache before fill
data arrives.
index_h<25:4>
O
22
Index. These signals index the Bcache.
Table 2 21164 Signal Descriptions
(Sheet 6 of 12)
Signal
Type Count Description
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