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Intel
®
82575EB Gigabit Ethernet Controller — Flow Control Receive Threshold Low - FCRTL
(02160h; R/W)
Intel
®
82575EB Gigabit Ethernet Controller 324632-003
Software Developer’s Manual and EEPROM Guide Revision: 2.1
356 January 2011
14.3.53 Flow Control Receive Threshold Low - FCRTL
(02160h; R/W)
This register contains the receive threshold used to determine when to send an XON packet The
complete register reflects the threshold in units of bytes. The lower 4 bits must be programmed to 0b
(16 byte granularity). Software must set XONE to enable the transmission of XON frames. Each time
hardware crosses the receive-high threshold (becoming more full), and then crosses the receive-low
threshold and XONE is enabled (1b), hardware transmits an XON frame. When XONE is set, the RTL
field should be programmed to at least 1b (at least 16 bytes).
Flow control reception/transmission are negotiated capabilities by the Auto-Negotiation process. When
the 82575 is manually configured, flow control operation is determined by the CTRL.RFCE and
CTRL.TFCE bits.
Field Bit(s)
Initial
Value
Description
Reserved 0 0b Reserved
PSR_type1 1 1b Header includes MAC, (VLAN/SNAP) IPv4 only
PSR_type2 2 1b Header includes MAC, (VLAN/SNAP) IPv4, TCP only
PSR_type3 3 1b Header includes MAC, (VLAN/SNAP) IPv4, UDP only
PSR_type4 4 1b Header includes MAC, (VLAN/SNAP) IPv4, IPv6 only
PSR_type5 5 1b Header includes MAC, (VLAN/SNAP) IPv4, IPv6, TCP only
PSR_type6 6 1b Header includes MAC, (VLAN/SNAP) IPv4, IPv6, UDP only
PSR_type7 7 1b Header includes MAC, (VLAN/SNAP) IPv6 only
PSR_type8 8 1b Header includes MAC, (VLAN/SNAP) IPv6, TCP only
PSR_type9 9 1b Header includes MAC, (VLAN/SNAP) IPv6, UDP only
Reserved 10 1b Reserved
PSR_type11 11 1b Header includes MAC, (VLAN/SNAP) IPv4, TCP, NFS only
PSR_type12 12 1b Header includes MAC, (VLAN/SNAP) IPv4, UDP, NFS only
Reserved 13 1b Reserved
PSR_type14 14 1b Header includes MAC, (VLAN/SNAP) IPv4, IPv6, TCP, NFS only
PSR_type15 15 1b Header includes MAC, (VLAN/SNAP) IPv4, IPv6, UDP, NFS only
Reserved 16 1b Reserved
PSR_type17 17 1b Header includes MAC, (VLAN/SNAP) IPv6, TCP, NFS only
PSR_type18 18 1b Header includes MAC, (VLAN/SNAP) IPv6, UDP, NFS only
Reserved 31:19 0h Reserved
Field Bit(s)
Initial
Value
Description
Reserved 3:0 0000b Reserved
Must be written with 0b.