CHAPTER 5 REGISTERS
PRELIMINARY
NEC confidential and Proprietary
201
(28) Receive ATM mode register (MDATMR)
The MDATMR register sets the modes related to receive ATM operation.
Address
Register
Name
Port0: Port1: Port2: Port3:
Access Default
MDATMR
0088 H
0488 H
0888 H
0C88 H
R/W
000000A8 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
Reserved
HECO CSCM LCDDT
OCDT[1:0]
OCDD[1:0]
HECCM HECDC[1:0]
Bit Field
Function
Default
D31-
D10
Reserved
Set to 0.
0
D9
HECO
Controls the HEC verification of a receive cell.
1: Disabled
0: Enabled
0
D8
CSCM
Controls descramble of a cell.
1: Not descramble
0: Descramble
0
D7
LCDDT
Changes the LCD detection and termination condition.
1: LCD status is detected if OCD status lasts for 4 ms.
LCD status is terminated if cell synchronization status lasts for 4ms.
0: LCD status is detected at the same time as OCD detection.
LCD status is terminated at the same time as OCD termination.
1
D6-D5
OCDT[1:0]
Changes the number of backward protection stages
δ
for OCD detection. The OCD
status is cleared if the correct HEC has been detected in the receive cell stream
δ
+
1 times in a row.
11: 8
10: 7
01: 6
00: 5
01
D4-D3
OCDD[1:0]
Sets the number of forward protection stages
α
for OCD detection. The
µ
PD98413
is placed in the OCD status if it cannot detect the correct HEC in the receive cell
stream
α
times in a row.
11: 9
10: 8
01: 7
00: 6
01
D2
HECCM
Controls 1-bit error correction of a header by HEC verification.
1: Does not correct bit error and drops cell.
0: Corrects bit error and passes cell.
0
D1-D0 HECDC[1:0]
Changes the number of recovery stages
ε
from "detection mode" to "correction
mode" in HEC verification status transition.
11: Setting prohibited
10: 4
01: 2
00: 1
00
Содержание NEASCOT-P65
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