CX81801-7x/8x SmartV.XX Modem Data Sheet
Table 3-2. CX81801 Modem Pin Signal Definitions for Parallel Interface (PARIF = High) (Continued)
Label
DSPKOUT
PWRCLKP
PWRCLKN
DIB_DATAP
DIB_DATAN
A0-A9,
A10-A15,
A16 (PB0),
A17 (PB4),
A18 (PB5)
D0-D7
READ#
WRITE#
ROMSEL# (PB2)
RAMSEL# (PB3)
RESERVED (PB1)
EXT_RES# (PB6)
IASLEEP (P_PF05)
M_CLK (P_PB00)
SR2CLK (P_PGP05)
SA2CLK (P_PX05)
SR3OUT
SR3IN (P_PX01)
SR2IO (P_PX06)
Pin
98
96
97
93
94
71-77, 79-81,
84, 86-89, 91,
99,
105,
106
62-67, 69-70
119
118
102
104
101
107
50
37
92
38
35
36
39
I/O I/O Type
Signal Name/Description
Speaker Interface
O
It/Ot2
Modem Speaker Digital Output. The DSPKOUT digital output
reflects the received analog input signal digitized to TTL high or low
level by an internal comparator.
DIB Interface
O
Odpc
Clock and Power Positive. Provides clock and power to the LSD.
Connect to DIB transformer primary winding non-dotted terminal.
O
Odpc
Clock and Power Negative. Provides clock and power to the LSD.
Connect to DIB transformer primary winding dotted terminal.
I/O Idd/Odd Data Positive. Transfers data, control, and status information
between the Smart Modem and the LSD. Connect to LSD through
DIB data positive channel components.
I/0 Idd/Odd Data Negative. Transfers data, control, and status information
between the Smart Modem and the LSD. Connect to LSD through
DIB data negative channel components.
External Bus Interface
O, It/Ot8,
O, It/Ot8,
O, It/Ot2,
O, It/Ot2,
O
It/Ot2
Address Lines 0-18. A0-A18 are the address output lines used to
access external memory; up to 4 Mb (512 KB) ROM/flash ROM
using A0-A18 and up to 1 Mb (128 KB) RAM using A0-A16.
The 256 KB base modem ROM code is located in the 0-256 KB
address range.
I/O Ith/Ot2
Data Line 0-7. D0-D7 are the bidirectional external memory bus
data lines.
O
It/Ot2
Read Enable. READ# output low enables data transfer from the
selected device to the D0-D7 lines.
O
It/Ot2
Write Enable. WRITE# output low enables data transfer from the
D0-D7 lines to the selected device.
O
Ot2
ROM Select. ROMSEL# (PB2, ES3) output low selects the external
ROM/flash ROM.
O
It/Ot2
RAM Select. RAMSEL# (PB3, ES2) output low selects the external
RAM.
O
It/Ot2
Reserved. PB1 (ES4) is used internally. Leave open.
O
It/Ot2
External Device Reset. Active low reset for external devices.
Leave open if not used.
CX20442 VC Interface
O
Ot2
Modem Sleep. Connect to VC SLEEP pin.
O
It/Ot2
Master Clock Output. Connect to VC M_CLKIN pin.
I
Itpu/Ot2 Voice Serial Clock input. Connect to VC M_SCK pin.
I
Itpu/Ot2 Voice Serial Frame Sync Input. Connect to VC M_STROBE pin.
O
Ot2
Voice Serial Transmit Data Output. Connect to VC M_TXSIN pin.
I
Itk/Ot2
Voice Serial Receive Data Input. Connect to VC M_RXOUT pin.
O
It/Ot2
Voice Control Output. Connect to VC M_CNTRLSIN pin.
102199B
Conexant
3-9