CN8478 Datasheet, PDF (38/221 Pages) Conexant Systems, Inc – Multichannel Synchronous Communications Controller (MUSYCC)

1.0 System Description
1.1 Pin Descriptions
CN8478/CN8474A/CN8472A/CN8471A
Multichannel Synchronous Communications Controller (MUSYCC™)
Table 1-4. CN8478 Hardware Signal Definitions (6 of 6)
MQFP
Pin No.
Pin Label
Signal Name
I/O
Definition
35
TCK JTAG Clock
36
TRST* JTAG Reset
I Clock in the TDI and TMS signals and clock out TDO signal.
I An active-low input that resets the JTAG state machine. This pin
should be pulled low in normal operation.
37
TMS JTAG Mode Select
I The test signal input decoded by the TAP controller to control
test operations.
38
TDO JTAG Data Output
t/s O The test signal that transmits serial test instructions and tests
data.
39
TDI
JTAG Data Input
I The test signal that receives serial test instructions and tests
data.
112-114
TM[0]
TM[1]
TM[2]
Test Mode
I Encodes test modes.
These pins have internal pull-downs and may be left open by
the system designer.
TM[0]
0
1
TM[1]
0
1
TM[2]
0
1
Normal Operation. Tie to ground.
All outputs three-stated.
(2)
VDDc Power
VDDi⁽³⁾
VDDo
VGG
– 19 pins are provided for power. Four VDDc (core), four VDDi
(input), nine VDDo (output), and two VGG (5 V-tolerant supply).
The VDDc require 2.5 V +/- 5%, the VDDi and VDDo require 3.3 V
+/- 5%, and the VGG require 5 V +/- 5%. The recommended
power ramp sequence is VDDi and VDDo together, then VDDc at
t = 0⁺. VGG can be powered at any time.
(3)
VSS^{(3) Ground}
VSSo
– 27 pins are provided for ground, 0 V DC. 10 VSS (core and input)
and 17 VSSo (output).
NOTE(S):
(1) _{These pins have internal pullups and may be left open by the system designer.}
(2) _{VDDc Pin Numbers: 27, 77, 132, 185}
VDDi Pin Numbers: 13, 67, 118, 171
VDDo Pin Numbers: 42, 63, 81, 95, 110, 147, 164, 181, 201
VGG Pin Numbers: 52, 156
(3) _{VSS Pin Numbers: 14, 28, 53, 68, 78, 119, 133, 157, 172, 186}
VSSo Pin Numbers: 44, 55, 64, 73, 82, 89, 96, 104, 111, 137, 148, 153, 165, 175, 182, 191, 202
(4) _{An active low signal is denoted by a trailing asterisk (*).}
1-24
Conexant
100660E