Data Sheet

Ethernet Controller I210 —Flash Map
228
6.7.6.7 MAC Tx Control Reg2 (TxCntrlReg1 (31:16]) - Offset 0x6
6.7.6.8 Reserved - Offset 0x7
6.7.6.9 NC-SI Flow Control XOFF - Offset 0x8
6.7.6.10 NC-SI Flow Control XON - Offset 0x9
Bits Name
Default
HW Mode
Description Reserved
15:0 Reserved Reserved. Should be set to 0x0.
Bits Name
Default
HW Mode
Description Reserved
15:0 Reserved Reserved. Should be set to 0x0.
Bits Name
Default
HW Mode
Description Reserved
15:0 XOFF Threshold
Tx buffer watermark for sending a XOFF NC-SI flow control packet
in bytes. The XOFF Threshold value refers to the occupied space in
the buffer.
Notes:
1. Field relevant for NC-SI operation mode only.
2. To support a maximum packet size of 1.5 KB, the value
programmed should be:
Tx buffer size (refer to Section 6.7.6.8) - 3,400 bytes.
a. When Tx buffer size is 6 KB value of field should be
0xAB8 (2,744 bytes).
Bits Name
Default
HW Mode
Description Reserved
15:0 XON Threshold
Tx buffer water mark for sending a XON NC-SI flow control packet
in bytes. The XON Threshold value refers to the available space in
the TX buffer.
Notes:
1. Field relevant for NC-SI operation mode only.
2. To support maximum packet size of 1.5 KB, the value
programmed should be a positive value that equals:
TX Buffer size (refer to Section 6.7.6.8) - XOFF Threshold
(refer to Section 6.7.6.9) + 1536 bytes.
a. When the TX Buffer size is 6 KB and the XOFF Threshold
is 2,744 bytes value of field should be 0x1348 (4,936
bytes).