CHAPTER 5 REGISTERS
PRELIMINARY
NEC confidential and Proprietary
159
CHAPTER 5 REGISTERS
The
µ
PD98413 has registers that can be accessed via the CPU interface. These registers are used to specify
commands, set operation modes, and analyze interrupt causes.
[Caution]
The data bit string of the SONET/SDH frame is sequentially transmitted from the MSB when it is transmitted from
the line interface (circuit side). In this document, the MSB is always shown on the left side in tables and figures.
Note that each bit in the overhead byte (OH byte) of the SONET/SDH frame is described in the following two ways:
Description
<1>
Bits 1 to 8
This description is mainly used to indicate the bit string of the overhead byte in the SONET/SDH frame in the
order in which the bits are output from the line interface.
Description
<2>
D31 to D0 bits
This description is mainly used to indicate the bits in an internal register of the
µ
PD98413. The bits
correspond to the AD31 to AD0 pins of the external CPU interface.
<1>
Indicating bits in overhead byte
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Bit 8
1 2 3 4 5
D31
D23
D15
D7
D30
D22
D14
D6
D29
D21
D13
D5
D28
D20
D12
D4
D27
D19
D11
D3
D26
D18
D10
D2
D25
D17
D9
D1
D24
D16
D8
D0
<2>
Indicating bits in internal register
(D31 is input/output to/from data bus AD31 of the CPU interface.)
In this document, the following two descriptions are also used to indicate the same overhead byte in the
SDH/SONET frame.
H1 H1 H1
H1 H1 H2 H2
Description
<1>
1st H1
2nd H1
3rd H1
47th H1 48th H1 1st H1 2nd H1
Description
<2>
H1#1 H1#2 H1#3
H1#47
H1#48
H1#1 H1#2
Transmission
sequence
Содержание NEASCOT-P65
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