Datasheet

PIC32MX5XX/6XX/7XX
DS60001156H-page 300  2009-2013 Microchip Technology Inc.
REGISTER 24-12: ETHRXWM: ETHERNET CONTROLLER RECEIVE WATERMARKS REGISTER
Bit Range
Bit
31/23/15/7
Bit
30/22/14/6
Bit
29/21/13/5
Bit
28/20/12/4
Bit
27/19/11/3
Bit
26/18/10/2
Bit
25/17/9/1
Bit
24/16/8/0
31:24
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
23:16
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
RXFWM<7:0>
15:8
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
7:0
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
RXEWM<7:0>
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 31-24 Unimplemented: Read as ‘0’
bit 23-16 RXFWM<7:0>: Receive Full Watermark bits
The software controlled RX Buffer Full Watermark Pointer is compared against the RX BUFCNT to
determine the full watermark condition for the FWMARK interrupt and for enabling Flow Control when
automatic Flow Control is enabled. The Full Watermark Pointer should always be greater than the Empty
Watermark Pointer.
bit 15-8 Unimplemented: Read as ‘0’
bit 7-0 RXEWM<7:0>: Receive Empty Watermark bits
The software controlled RX Buffer Empty Watermark Pointer is compared against the RX BUFCNT to
determine the empty watermark condition for the EWMARK interrupt and for disabling Flow Control when
automatic Flow Control is enabled. The Empty Watermark Pointer should always be less than the Full
Watermark Pointer.
Note: This register is only used for RX operations.