lan9220 Standard Microsystems Corp., lan9220 Datasheet - Page 134

• Manufacturer Part Number: lan9220
• Description: 16-bit Non-pci Small Form Factor 10/100 Ethernet Controller With Variable Voltage I/o & Hp Auto-mdix Support
• Manufacturer: Standard Microsystems Corp.

Revision 2.6 (12-04-08)
6.7
SYMBOL
t
cycle
t
t
t
t
t
t
csh
asu
dsu
csl
ah
dh
nCS, nWR
Data Bus
A[7:1]
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.
Note: The “Data Bus” width is 16 bits.
Note: A PIO Write cycle begins when both nCS and nWR are asserted. The cycle ends when either
PIO Writes
DESCRIPTION
Write Cycle Time
nCS, nWR Deassertion Time (see Note below)
Address Setup to nCS, nWR Assertion
Address Hold Time
Data Setup to nCS, nWR Deassertion
Data Hold Time
nCS, nWR Assertion Time
or both nCS and nWR are deasserted. They may be asserted and deasserted in any order.
Parameters t
csh
and t
Figure 6.6 PIO Write Cycle Timing
Table 6.7 PIO Write Cycle Timing
16-bit Non-PCI Small Form Factor 10/100 Ethernet Controller with Variable Voltage I/O & HP Auto-MDIX Support
csl
must be extended using wait states to meet the t
DATASHEET
134
MIN
165
32
13
0
7
0
0
TYP
133
cycle
MAX
minimum.
SMSC LAN9220
Datasheet
UNITS
ns
ns
ns
ns
ns
ns
ns