参数资料
型号: RTPXA270C0C312
厂商: INTEL CORP
元件分类: 微控制器/微处理器
英文描述: 312 MHz, RISC PROCESSOR, PBGA356
封装: 13 X 13 MM, 1 MM HEIGHT, 0.50 MM PITCH, LEAD FREE, VFBGA-356
文件页数: 4/128页
文件大小: 1560K
代理商: RTPXA270C0C312
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
MAX2
Units1
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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