LAN9218I_07 SMSC [SMSC Corporation], LAN9218I_07 Datasheet - Page 118
LAN9218I_07
Manufacturer Part Number
LAN9218I_07
Description
High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX and Industrial Temperature Support
Manufacturer
SMSC [SMSC Corporation]
Datasheet
1.LAN9218I_07.pdf
(133 pages)
- Current page: 118 of 133
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Revision 1.8 (06-06-07)
6.2
SYMBOL
t
t
cycle
t
t
t
t
t
csdv
t
t
asu
don
doff
doh
csh
nCS, nRD
csl
ah
A[7:1]
Data Bus
PIO reads can be used to access CSRs or RX Data and RX/TX status FIFOs. In this mode, counters
in the CSRs are latched at the beginning of the read cycle. Read data is valid as indicated in the timing
diagram. PIO reads can be performed using Chip Select (nCS) or Read Enable (nRD). Either or both
of these control signals must go high between cycles for the period specified.
PIO reads are supported for both 16- and 32-bit access. Timing for 16-bit and 32-bit PIO Read cycles
is identical with the exception that D[31:16] are not driven during a 16-bit read.
Note: Some registers have restrictions on the timing of back-to-back, write-read and read-read
Note: The “Data Bus” width is 32 bits with optional support for 16-bit bus widths
Note: A PIO Read cycle begins when both nCS and nRD are asserted. The cycle ends when either
PIO Reads
DESCRIPTION
Read Cycle Time
nCS, nRD Assertion Time
nCS, nRD Deassertion Time
nCS, nRD Valid to Data Valid
Address Setup to nCS, nRD Valid
Address Hold Time
Data Buffer Turn On Time
Data Buffer Turn Off Time
Data Output Hold Time
cycles.
or both nCS and nRD are deasserted. They may be asserted and deasserted in any order.
Figure 6.1 PIO Read Cycle Timing
High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX and Industrial Temperature Support
Table 6.3 PIO Read Timing
DATASHEET
118
MIN
45
32
13
0
0
0
0
TYP
MAX
30
7
SMSC
LAN9218i
Datasheet
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
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