Datasheet

38.8.107 GMAC Credit-Based Shaping IdleSlope Register for Queue B
Name: GMAC_CBSISQB
Offset: 0x4C4
Reset: 0x00000000
Property: Read/Write
Credit-based shaping must be disabled in the GMAC_CBSCR before updating this register.
Bit 31 30 29 28 27 26 25 24
IS[31:24]
Access
Reset 0 0 0 0 0 0 0 0
Bit 23 22 21 20 19 18 17 16
IS[23:16]
Access
Reset 0 0 0 0 0 0 0 0
Bit 15 14 13 12 11 10 9 8
IS[15:8]
Access
Reset 0 0 0 0 0 0 0 0
Bit 7 6 5 4 3 2 1 0
IS[7:0]
Access
Reset 0 0 0 0 0 0 0 0
Bits 31:0 – IS[31:0] IdleSlope
IdleSlope value for queue B in bytes/second.
The IdleSlope value is defined as the rate of change of credit when a packet is waiting to be sent. This must not
exceed the port transmit rate which is dependent on the speed of operation, e.g., 100 Mb/second = 32'h017D7840.
If 50% of bandwidth was to be allocated to a particular queue in 100 Mb/sec mode, then the IdleSlope value for that
queue would be calculated as 32'h017D7840 / 2
SAM E70/S70/V70/V71 Family
GMAC - Ethernet MAC
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2019 Microchip Technology Inc.
Datasheet
DS60001527D-page 740