UPD98404 Datasheet, PDF (4/36 Pages) NEC – ADVANCED ATM SONET FRAMER

Serial to
parallel
Frame
synchro-
nization
(A1, A2)
Pointer processor
Descrambler
Cell
synchronization
HEC verification
HEC correction
Cell
descrambler
Rx FIFO,
7 cells
Parallel to
serial
+
Scrambler
+
Cell
scrambler
HEC
generator
Tx FIFO,
7 cells
BIP generator
(transmit side)
Transmission overhead
processor
(A1, A2, K2, Z2,
G1, H1, H2, H3)
Reception overhead
processor
(K2, Z2, G1, H1, H2, H3)
Transmission
overhead registers
(J0, Z0, C2, K2,etc.)
BIP generator
(receive side)
Transmission
timing generator
OAM controller
(performance register, etc.)
Reception
overhead registers
(J0, Z0, C2, K2, etc.)
Interrupt source
register
Mode register