Tc (Total Cell) Counter Minimum Threshold Registers (0060H, 0064H, 0068H, 006Ch) - NEC mPD98410 User Manual

4.3.23 TC (Total Cell) counter minimum threshold registers (0060h, 0064h, 0068h, 006Ch)

Register name Address
TCminCRV 0060h
TCminRNV 0064h
TCminABR 0068h
TCminUBR 006Ch
15 14 13
These registers specify the minimum number of guaranteed cells for each class. The minimum number of cells
guaranteed for each class is counted after the number of cells has exceeded the minimum number of guaranteed
cells for each logical output port.
Be sure to set the minimum threshold value before enabling the switching operation by using the CMD register.
Once the switching operation has been enabled, do not re-set the threshold value; otherwise, queue management
cannot be guaranteed and the µ PD98410 will malfunction.
Field Bit
TCminCRV bit [13:7]
TCminRNV bit [15:7]
TCminABR bit [15:7]
TCminUBR bit [15:7]
158
CHAPTER 4 INTERNAL REGISTERS
Default
xx00_0000_0xxx_xxxx
0000_0000_0xxx_xxxx
0000_0000_0xxx_xxxx
0000_0000_0xxx_xxxx
12 11 10 9 8
TCminCRV
TCminRNV
TCminABR
TCminUBR
R/W
R/W 00_0000_0 to 11_1111_1: Minimum number of guaranteed cells in
R/W 0000_0000_0 to 1111_1111_1: Minimum number of guaranteed
R/W 0000_0000_0 to 1111_1111_1: Minimum number of guaranteed
R/W 0000_0000_0 to 1111_1111_1: Minimum number of guaranteed
R/W
R/W
R/W
R/W
R/W
7 6 5 4 3
Function
CBR + rtVBR class
(in 128-cell units: 0/128/256/ ... /16256)
cells in RM + nrtVBR class
(in 128-cell units: 0/128/256/ ... /65408)
cells in ABR class
(in 128-cell units: 0/128/256/ ... /65408)
cells in UBR class
(in 128-cell units: 0/128/256/ ... /65408)
2 1 0
Default Value
00_0000_0
(0000h)
0000_0000_0
(0000h)
0000_0000_0
(0000h)
0000_0000_0
(0000h)