Bt8370/8375/8376
1.0 Pin Descriptions
1.1 Pin Assignments
Fully Integrated T1/E1 Framer and Line Interface
Figure 1-2. Bt8370/8375/8376 Logic Diagram
28 RST*
29 MCLK
78 MOTO*
Hardware Reset
Processor Clock
Motorola Bus mode
Sync Bus mode
Clock mode
I
I
I
I
I
I
1
SYNCMD
ONESEC 32 PIO 1-second Timer
26 CLKMD
Microprocessor
Interface
(1)
INTR*
3
O
O
Interrupt Request
A[8:0]
Address Bus
(MPU)
(1)
DTACK* 77
Data Transfer Acknowledge
AD[7:0]
Data Bus or Address/Data I/O
5
2
4
6
AS* (ALE)
CS*
Address Strobe
Chip Select
I
I
I
I
DS* (RD*)
R/W*(WR*)
Read or Data Strobe
Write Strobe or Read/Write
79 XOE
Transmit Output Enable
Receive Tip
I
I
73
74
61
RTIP
Receive, Transmit
Line Interface
(RLIU, TLIU)
XTIP 58
O
O
Transmit Tip
RRING
VSET
Receive Ring
I
57
XRING
Transmit Ring
Voltage Reference Set I/O
65
51
41
TCKI
Tx Clock In
All Ones Clock
I
I
I
Tx Clock Output
Digital
Transmitter
(XMTR)
TCKO 64
O
O
ACKI
Tx Positive Out/Tx NRZ Data(2)
TPOSO/TNRZO 27
TPOSI/TDLI
TNEGI/TDLCKO
Tx Positive In/TDL Data In
Tx Negative In/TDL Clock
Tx Negative Out/(2)
Tx Multiframe Sync
39
PIO 38
TNEGO/MSYNCO
O
76
I
RCKO 48
O
O
RCKI
Rx Clock Out
Rx Clock In
Rx Positive In
Rx Negative In
Digital
Receiver
(RCVR)
RPOSO/RDLO 47
70
I
RPOSI
RNEGI
Rx Positive Out/RDL Data Out
71
I
RNEGO/RDLCKO 46
O
Rx Negative Out/RDL Clock Out
TSB Time Slot Indicator(2)
37
I
TSBCKI
TPCMI
TINDO 27
O
TSB Clock
TSB Data
Transmit
TFSYNC 35 PIO TSB Frame Sync
34
I
System Bus
(TSB)
33
I
TSIGI
TMSYNC 36 PIO TSB Multiframe Sync
TSB Signaling
45
I
RPCMO 42
RSIGO 40
RINDO 39
O
O
O
RSB Data Out
RSBCKI
RSB Clock
RSB Signaling Out
RSB Time Slot Indicator(2)
Receive
System Bus
(RSB)
RFSYNC 43 PIO RSB Frame Sync
RMSYNC 44 PIO RSB Multiframe Sync
SIGFRZ 80
O
Signaling Freeze
CLAD Out (NC)(3)
67 CLADI
CLAD In
I
I
CLADO 66
O
Clock Rate
Adapter (CLAD)
68 REFCKI
Reference Clock
TCK
53
52
55
Test Clock
Test Mode Select
Test Data In
I
I
I
TDO 54
O
Test Data Out
Boundary Scan
(JTAG)
TMS
TDI
I = Input, O = Output,
PIO = Programmable I/O; controls located at PIO (address 018)
NOTE(S):
(1)
(2)
(3)
Refer to Figure 1-1 Bt8370/8375/8376 Pinout Diagram.
Pins 27 and 39 shown twice for clarity; pin function controlled by PIO (addr 018).
Pin 66 is not connected for the Bt8376 device.
N8370DSE
Conexant
1-3
CONEXANT [ CONEXANT SYSTEMS, INC ]
