Datasheet

PIC32MZ Embedded Connectivity with Floating Point Unit (EF) Family
DS60001320B-page 556 Preliminary  2015 Microchip Technology Inc.
REGISTER 30-26: EMAC1IPGR: ETHERNET CONTROLLER MAC NON-BACK-TO-BACK
INTERPACKET GAP 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 R/W-0 R/W-0 R/W-0 R/W-1 R/W-1 R/W-0 R/W-0
— NB2BIPKTGP1<6:0>
7:0
U-0 R/W-0 R/W-0 R/W-1 R/W-0 R/W-0 R/W-1 R/W-0
— NB2BIPKTGP2<6:0>
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 31-15 Unimplemented: Read as ‘0’
bit 14-8 NB2BIPKTGP1<6:0>: Non-Back-to-Back Interpacket Gap Part 1 bits
This is a programmable field representing the optional carrierSense window referenced in section
4.2.3.2.1 “Deference” of the IEEE 80.23 Specification. If carrier is detected during the timing of IPGR1, the
MAC defers to carrier. If, however, carrier becomes after IPGR1, the MAC continues timing IPGR2 and
transmits, knowingly causing a collision, thus ensuring fair access to medium. Its range of values is 0x0 to
IPGR2. Its recommend value is 0xC (12d).
bit 7 Unimplemented: Read as ‘0’
bit 6-0 NB2BIPKTGP2<6:0>: Non-Back-to-Back Interpacket Gap Part 2 bits
This is a programmable field representing the non-back-to-back Inter-Packet-Gap. Its recommended value
is 0x12 (18d), which represents the minimum IPG of 0.96 µs (in 100 Mbps) or 9.6 µs (in 10 Mbps).
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.