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): 89/115頁
文件大?。?/td> 846K
代理商: ALPHA 21164
Electrical Data
89
AC Characteristics
each pin is 11 mA or less for normal output drivers or 25 mA or less for big output
drivers. The following equation can be used to determine the maximum capacitance
that can be safely driven by each pin:
For normal output drivers: C
max
(in pF) = 5t, where t is the waveform period
(measured from rising to rising or falling to falling edge), in nanoseconds.
For big output drivers: C
max
(in pF) = 7t, where t is the waveform period (mea-
sured from rising to rising or falling to falling edge), in nanoseconds.
For example, if the waveform appearing on a given normal I/O pin has a 15.0-ns
period, it can safely drive up to and including 75 pF.
Figure 16 shows the Bcache read and write timing.
Figure 16 Bcache Timing
11.4.2.2 sys_clk-Based Systems
All timing is specified relative to the rising edge of the internal CPU clock.
Table 30 shows 21164 system clock
sys_clk_out1_h,l
output timing. Setup and hold
times are specified independent of the relative capacitive loading of
sys_clk_out1_h,l
,
addr_h<39:4>
,
data_h<127:0>
, and
cmd_h<3:0>
signals. The
ref_clk_in_h
signal must be tied to
Vdd
for proper operation.
LJ-03409.AI4
CPU Clock
Index Out
Bcache Loop (Read)
Data in
CPU Clock
Index Out
Bcache Loop (Write)
Data Out
Tiod
Tdsu
Tioh
Tdh
BC_RD_SPD
Tiod
Tdoh
Tioh
Tdod
BC_WR_SPD
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