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LAN9220 bảng dữ liệu(PDF) 121 Page - Microchip Technology

tên linh kiện LAN9220
Giải thích chi tiết về linh kiện  16-bit Non-PCI Small Form Factor 10/100 Ethernet Controller with Variable Voltage I/O & HP Auto-MDIX Support
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Trang chủ  http://www.microchip.com
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LAN9220 bảng dữ liệu(HTML) 121 Page - Microchip Technology

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 2006-2017 Microchip Technology Inc.
DS00002417A-page 121
LAN9220
6.7
PIO Writes
PIO writes are used for all LAN9220 write cycles. PIO writes can be performed using Chip Select (nCS) or Write Enable
(nWR). Either or both of these control signals must go high between cycles for the period specified.
FIGURE 6-6:
PIO WRITE CYCLE TIMING
Note:
The “Data Bus” width is 16 bits.
TABLE 6-7:
PIO WRITE CYCLE TIMING
Symbol
Description
MIN
TYP
MAX
Units
tcycle
Write Cycle Time
165
ns
tcsl
nCS, nWR Assertion Time
32
ns
tcsh
nCS, nWR Deassertion Time (see Note below)
13
133
ns
tasu
Address Setup to nCS, nWR Assertion
0
ns
tah
Address Hold Time
0
ns
tdsu
Data Setup to nCS, nWR Deassertion
7
ns
tdh
Data Hold Time
0
ns
Note:
A PIO Write cycle begins when both nCS and nWR are asserted. The cycle ends when either or both nCS
and nWR are deasserted. They may be asserted and deasserted in any order. Parameters tcsh and tcsl
must be extended using wait states to meet the tcycle minimum.
Data Bus
nCS, nWR
A[7:1]



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