lan9221 Standard Microsystems Corp., lan9221 Datasheet - Page 135

• Manufacturer Part Number: lan9221
• Description: High-performance 16-bit Non-pci 10/100 Ethernet Controller With Variable Voltage I/o
• Manufacturer: Standard Microsystems Corp.

High-Performance 16-bit Non-PCI 10/100 Ethernet Controller with Variable Voltage I/O
Datasheet
SMSC LAN9221/LAN9221i
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 LAN9221/LAN9221i 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
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.
Figure 6.6 PIO Write Cycle Timing
Table 6.7 PIO Write Cycle Timing
DATASHEET
135
MIN
45
32
13
0
7
0
0
TYP
MAX
Revision 2.6 (12-04-08)
UNITS
ns
ns
ns
ns
ns
ns
ns