lan9217 Standard Microsystems Corp., lan9217 Datasheet - Page 127
lan9217
Manufacturer Part Number
lan9217
Description
Lan9217 16-bit High-performance Single-chip 10/100 Ethernet Controller With Hp Auto-mdix Support
Manufacturer
Standard Microsystems Corp.
Datasheet
1.LAN9217.pdf
(138 pages)
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16-bit High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX Support
Datasheet
SMSC LAN9217
6.7
SYMBOL
FIFO_SEL
nCS, nWR
Data Bus
t
cycle
t
t
t
t
t
t
asu
dsu
csh
A[2:1]
csl
ah
dh
In this mode the upper address inputs are not decoded, and any write to the LAN9217 will write the
TX Data FIFO. This mode is enabled when FIFO_SEL is driven high during a write access. This is
normally accomplished by connecting the FIFO_SEL signal to a high-order address line. This mode is
useful when the host processor must increment its address when accessing the LAN9217. Timing is
identical to a PIO write, and the FIFO_SEL signal has the same timing characteristics as the address
lines.
Note: The “Data Bus” width is 16 bits.
Note: A TX Data FIFO Direct PIO Write cycle begins when both nCS and nWR are asserted. The
TX Data FIFO Direct PIO Writes
DESCRIPTION
Write Cycle Time
nCS, nWR Assertion Time
nCS, nWR Deassertion Time
Address, FIFO_SEL Setup to nCS, nWR Assertion
Address, FIFO_SEL Hold Time
Data Setup to nCS, nWR Deassertion
Data Hold Time
cycle ends when either or both nCS and nWR are deasserted. They may be asserted and
deasserted in any order.
Figure 6.6 TX Data FIFO Direct PIO Write Timing
Table 6.8 TX Data FIFO Direct PIO Write Timing
DATASHEET
127
MIN
45
32
13
0
0
7
0
TYP
MAX
Revision 2.3 (08-06-08)
UNITS
ns
ns
ns
ns
ns
ns
ns
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