CHAPTER 5 REGISTERS
PRELIMINARY
NEC confidential and Proprietary
202
(29) Drop cell header pattern register (DCHP)
The DCHP register sets the header pattern of a receive cell to be discarded as an invalid cell. By default, the
idle cells are dropped.
Address
Register
Name
Port0: Port1: Port2: Port3:
Access Default
DCHP
008C H
048C H
088C H
0C8C H
R/W
00000100 H
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Reserved
15
14
13
12
11
10 9 8 7 6 5 4 3 2 1 0
GFC[3:0] PTI[2:0]
CLP
GFCM[3:0]
PTIM[2:0]
CLPM
Bit Field
Function
Default
D31-
D16
Reserved
Set to 0.
0
D15-
D12
GFC[3:0]
0000
D11-D9 PTI[2:0]
000
D8 CLP
A receive cell with VPI/VCI being all 0 is verified with the pattern that is the cell
header area other than the VPI/VCI area set in this area. The cell that coincides
with the pattern in this area is not stored to the receive FIFO but dropped. However,
the bit that is masked by the low-order eight bits of this area is not masked but
treated as Don't Care.
1
D7-D4 GFCM[3:0]
0000
D3-D1 PTIM[2:0]
000
D0 CLPM
This field masks the high-order eight bits.
The bit of the cell header that is set to 1 in this area is not verified with the bit setting
of the high-order eight bits.
0
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