lan9215i Standard Microsystems Corp., lan9215i Datasheet - Page 124

• Manufacturer Part Number: lan9215i
• Description: Lan9215i 16-bit Non-pci 10/100 Ethernet Controller With Hp Auto-mdix And Industrial Temperature Support
• Manufacturer: Standard Microsystems Corp.

Revision 2.3 (08-06-08)
6.4
SYMBOL
t
t
cycle
t
t
t
t
t
csdv
t
t
asu
don
doff
doh
csh
csl
ah
FIFO_SEL
nCS, nRD
A[2:1]
Data Bus
In this mode the upper address inputs are not decoded, and any read of the LAN9215i will read the
RX Data FIFO. This mode is enabled when FIFO_SEL is driven high during a read access. This is
normally accomplished by connecting the FIFO_SEL signal to high-order address line. This mode is
useful when the host processor must increment its address when accessing the LAN9215i. Timing is
identical to a PIO read, and the FIFO_SEL signal has the same timing characteristics as the address
lines.
Note that address lines A[2:1] are still used, and address bits A[7:3] are ignored.
Note: The “Data Bus” width is 16 bits.
Note: An RX Data FIFO Direct PIO Read cycle begins when both nCS and nRD are asserted. The
RX Data FIFO Direct PIO Reads
DESCRIPTION
Read Cycle Time
nCS, nRD Assertion Time
nCS, nRD Deassertion Time (see Note below)
nCS, nRD Valid to Data Valid
Address, FIFO_SEL Setup to nCS, nRD Valid
Address, FIFO_SEL Hold Time
Data Buffer Turn On Time
Data Buffer Turn Off Time
Data Output Hold Time
cycle ends when either or both nCS and nRD are de-asserted. They may be asserted and de-
asserted in any order. Parameters t
t
cycle
minimum.
Figure 6.3 RX Data FIFO Direct PIO Read Cycle Timing
Table 6.5 RX Data FIFO Direct PIO Read Timing
DATASHEET
16-bit Non-PCI 10/100 Ethernet Controller with HP Auto-MDIX and Industrial Temperature Support
124
csh
and t
csl
must be extended using wait states to meet the
MIN
165
32
13
0
0
0
0
TYP
133
MAX
30
7
SMSC LAN9215i
Datasheet
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns