lan9221 Standard Microsystems Corp., lan9221 Datasheet - Page 102

• Manufacturer Part Number: lan9221
• Description: High-performance 16-bit Non-pci 10/100 Ethernet Controller With Variable Voltage I/o
• Manufacturer: Standard Microsystems Corp.

Revision 2.6 (12-04-08)
BITS
0
Flow Control on Any Frame (FCANY). When this bit is set, the
LAN9221/LAN9221i will assert back pressure, or transmit a pause frame
when the AFC level is reached and any frame is received. Setting this bit
enables full-duplex flow control when the LAN9221/LAN9221i is operating in
full-duplex mode.
When this mode is enabled during half-duplex operation, the Flow Controller
does not decode the MAC address and will send a pause frame upon
receipt of a valid preamble (i.e., immediately at the beginning of the next
frame after the RX data FIFO level is reached).
When this mode is enabled during full-duplex operation, the Flow Controller
will immediately instruct the MAC to send a pause frame when the RX data
FIFO level is reached. The MAC will queue the pause frame transmission
for the next available window.
Setting this bit overrides bits [3:1] of this register.
[19:16]
Ah
Bh
Ch
Dh
Eh
Fh
0h
1h
2h
3h
4h
5h
6h
7h
8h
9h
Table 5.5 Backpressure Duration Bit Mapping
DESCRIPTION
100Mbs Mode
DATASHEET
100uS
150uS
200uS
250uS
300uS
350uS
400uS
450uS
500uS
550uS
600uS
10uS
15uS
25uS
50uS
5uS
102
BACKPRESSURE DURATION
High-Performance 16-bit Non-PCI 10/100 Ethernet Controller with Variable Voltage I/O
10Mbs Mode
102.2uS
152.2uS
202.2uS
252.2uS
302.2uS
352.2uS
402.2uS
452.2uS
502.2uS
552.2uS
602.2uS
TYPE
12.2uS
17.2uS
27.2uS
52.2uS
7.2uS
R/W
SMSC LAN9221/LAN9221i
DEFAULT
Datasheet
0