參數(shù)資料
型號(hào)： PXA270
廠(chǎng)商： Intel Corp.
英文描述： Electrical, Mechanical, and Thermal Specification
中文描述： 電氣，機(jī)械和熱規(guī)格
文件頁(yè)數(shù)： 101/126頁(yè)
文件大?。?/td> 1563K
代理商： PXA270
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Electrical, Mechanical, and Thermal Specification
6-37
Intel PXA270 Processor
AC Timing Specifications
6.4.6.1
Variable Latency I/O Read Timing
Figure 6-24
shows the timing for 32-bit variable-latency I/O (VLIO) memory reads.
Table 6-20
lists the timing parameters used in these diagrams.
Table 6-20. VLIO Timing
Symbols
Parameters
MIN
TYP
MAX
2
Units
1
Notes
tvlioAS
Address setup to nCS asserted
1
—
1
clk_mem
—
tvlioAH
Address hold from nPWE/nOE de-
asserted
2
MSCx[RDN]
30
clk_mem
—
tvlioASRW0
Address setup to nPWE/nOE
asserted (1st access)
3
—
3
clk_mem
—
tvlioASRWn
Address setup to nPWE/nOE
asserted (next access(es))
2
MSCx[RDN]
30
clk_mem
—
tvlioCES
nCS setup to nPWE/nOE asserted
2
—
2
clk_mem
—
tvlioCEH
nCS hold from nPWE/nOE de-
asserted
1
—
1
clk_mem
—
tvlioDSWH
MD/DQM setup (minimum) to nPWE
de-asserted
5
MSCx[RDF]+2
32
clk_mem
—
tvlioDH
MD/DQM hold from nPWE de-
asserted
1
—
1
clk_mem
—
tvlioDSOH
MD setup to address changing
1.5
—
clk_mem
—
tvlioDOH
MD hold from address changing
0
—
ns
—
tvlioRDYH
RDY hold from nPWE/nOE de-
asserted
0
—
—
ns
—
tvlioRWA
nPWE/nOE assert period between
writes
4
MSC[RDF]+1 +
Waits
31 +
Waits
clk_mem
—
tvlioRWD
nPWE/nOE de-asserted period
between writes
4
MSCx[RDN*2]
60
clk_mem
3
tvlioCD
nCS de-asserted after a read/write to
next nCS or nSDCS asserted
(minimum)
1
MSCx[RRR]*2 +
1
15
clk_mem
—
NOTES:
1. Numbers shown as integer multiples of the CLK_MEM period are ideal. Actual numbers vary with pin-to-pin differences in
loading and transition direction (rise or fall).
2. Maximum values reflect the register dynamic ranges.
3. Depending on the programmed value of MSC[RDN] and the clk_mem speed, this can be a significant amount of time.
Processor does not drive the data bus during this time between transfers. If the VLIO does not drive the data bus during this
time between transfers, the data bus is not driven for this period of time. If MSC[RDN] is programmed to 60 (which equals 60
CLK_MEM cycles), then the data bus could potentially not be driven for 30*2 = 60 CLK_MEM cycles.
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