lan9218i Standard Microsystems Corp., lan9218i Datasheet - Page 120

• Manufacturer Part Number: lan9218i
• Description: Lan9218i High-performance Single-chip 10/100 Ethernet Controller With Hp Auto-mdix And Industrial Temperature Support
• Manufacturer: Standard Microsystems Corp.

Revision 2.3 (08-06-08)
6.6
SYMBOL
t
cycle
t
t
t
t
t
t
asu
dsu
csh
csl
ah
dh
nCS, nWR
Data Bus
A[7:1]
PIO writes are used for all LAN9218i 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.
PIO Writes are valid for 16- and 32-bit access. Timing for 16-bit and 32-bit PIO write cycles are
identical with the exception that D[31:16] are ignored during a 16-bit write.
Note: The “Data Bus” width is 32 bits with optional support for 16-bit bus widths.
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 6.5 PIO Write Cycle Timing
Table 6.7 PIO Write Cycle Timing
High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX and Industrial Temperature Support
DATASHEET
120
MIN
45
32
13
0
0
7
0
TYP
MAX
SMSC LAN9218i
Datasheet
UNITS
ns
ns
ns
ns
ns
ns
ns