參數(shù)資料
型號(hào)： 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)： 29/115頁
文件大?。?/td> 846K
代理商： ALPHA 21164
Pinout and Signal Descriptions
29
21164 Signal Names and Functions
osc_clk_in_h
osc_clk_in_l
I
I
1
1
Oscillator clock inputs. These signals provide the differential
clock input that is the fundamental timing of the 21164. These
signals are driven at the same frequency as the internal clock
frequency (
clk_mode_h<2:0>
= 101).
perf_mon_h
I
1
Performance monitor. This signal can be used as an input to the
21164 internal performance monitoring hardware from offchip
events (such as bus activity).
port_mode_h<1:0>
I
2
Select test port interface modes (normal, manufacturing, and
debug). For normal operation, both signals must be deasserted.
pwr_fail_irq_h
I
1
Power failure interrupt request. This signal has multiple modes
of operation. During initialization, this signal is used to set up
sys_clk_out2_h,l
delay. During normal operation, this signal is
used to signal a power failure.
ref_clk_in_h
I
1
Reference clock input. Optional. Used to synchronize the tim-
ing of multiple microprocessors to a single reference clock. If
this signal is not used, it must be tied to
Vdd
for proper opera-
tion.
scache_set_h<1:0>
O
2
Secondary cache set. During a read miss request, these signals
indicate the Scache set number that will be filled when the data
is returned. This information can be used by the system to
maintain a duplicate copy of the Scache tag store.
shared_h
I
1
Keep block status shared. For systems without a Bcache, when
a WRITE BLOCK/NO VICTIM PENDING or WRITE
BLOCK LOCK command is acknowledged, this pin can be
used to keep the block status shared or private in the Scache.
srom_clk_h
O
1
Serial ROM clock. Supplies the clock that causes the SROM to
advance to the next bit. The cycle time of this clock is 128
times the cycle time of the CPU clock.
srom_data_h
I
1
Serial ROM data. Input for the SROM.
srom_oe_l
O
1
Serial ROM output enable. Supplies the output enable to the
SROM.
srom_present_l
1
B
1
Serial ROM present. Indicates that SROM is present and ready
to load the Icache.
Table 2 21164 Signal Descriptions
(Sheet 10 of 12)
Signal
Type Count Description
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