lan9117 Standard Microsystems Corp., lan9117 Datasheet - Page 126

• Manufacturer Part Number: lan9117
• Description: Lan9117 High-performance Single-chip 10/100 Non-pci Ethernet Controller
• Manufacturer: Standard Microsystems Corp.

Revision 1.5 (07-11-08)
6.7
FIFO_SEL
nCS, nWR
Data Bus
SYMBOL
A[2:1]
t
cycle
t
t
t
t
t
t
asu
dsu
csh
csl
ah
dh
In this mode the upper address inputs are not decoded, and any write to the LAN9117 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 LAN9117. 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
126
High Performance Single-Chip 10/100 Non-PCI Ethernet Controller
MIN
45
32
13
0
0
7
0
TYP
MAX
SMSC LAN9117
Datasheet
UNITS
ns
ns
ns
ns
ns
ns
ns