Datasheet

 2009-2013 Microchip Technology Inc. DS60001156H-page 321
PIC32MX5XX/6XX/7XX
REGISTER 24-30: EMAC1TEST: ETHERNET CONTROLLER MAC TEST 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
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
15:8
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
7:0
U-0 U-0 U-0 U-0 U-0 R/W-0 R/W-0 R/W-0
— — — — — TESTBP TESTPAUSE
(1)
SHRTQNTA
(1)
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 31-3 Unimplemented: Read as ‘0’
bit 2 TESTBP: Test Backpressure bit
1 = The MAC will assert backpressure on the link. Backpressure causes preamble to be transmitted, raising
carrier sense. A transmit packet from the system will be sent during backpressure.
0 = Normal operation
bit 1 TESTPAUSE: Test PAUSE bit
(1)
1 = The MAC Control sub-layer will inhibit transmissions, just as if a PAUSE Receive Control frame with a
non-zero pause time parameter was received
0 = Normal operation
bit 0 SHRTQNTA: Shortcut PAUSE Quanta bit
(1)
1 = The MAC reduces the effective PAUSE Quanta from 64 byte-times to 1 byte-time
0 = Normal operation
Note 1: This bit is only for testing purposes.
Note: Both 16-bit and 32-bit accesses are allowed to these registers (including the SET, CLR and INV registers).
8-bit accesses are not allowed and are ignored by the hardware.