28233-11 View Datasheet(PDF) - Conexant Systems
Part Name
Description
Manufacturer
28233-11 Datasheet PDF : 161 Pages
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CN8223
ATM Transmitter/Receiver with UTOPIA Interface
1.0 Product Description
1.10 Pin Definitions
Table 1-2. Hardware Signal Definitions (4 of 5)
Pin Label
Signal Name No.
SEL8BIT
8/16 Bit Mode
37
Select
PRCLK
Processor Clock
97
CS~
Chip Select
96
AS~
Address Strobe
94
W/R~
Write/Read Control 95
OE~
Output Enable
92
DL_INT
STAT_INT
D[0]
D[1]
D[2]
D[3]
D[4]
D[5]
D[6]
D[7]
D[8]
D[9]
D[10]
D[11]
D[12]
D[13]
D[14]
D[15]
FEAC/HDLC
63
Interrupt
Status/Counter
64
Interrupt
Processor Data
65
Bus
68
69
70
71
72
73
74
75
76
77
78
79
82
83
84
Type
CMOS/TTL
CMOS/TTL
CMOS/TTL
CMOS/TTL
CMOS/TTL
CMOS/TTL
CMOS/TTL
CMOS/TTL
CMOS/TTL
CMOS/TTL
CMOS/TTL
CMOS/TTL
CMOS/TTL
CMOS/TTL
CMOS/TTL
CMOS/TTL
CMOS/TTL
CMOS/TTL
CMOS/TTL
CMOS/TTL
CMOS/TTL
CMOS/TTL
CMOS/TTL
CMOS/TTL
I/O
Definition
I If asserted, this pin selects an 8-bit
microprocessor bus. If not asserted, it selects a
16-bit bus.
I Clock input to the microprocessor interface. All
inputs are synchronous to this clock except OE~.
All read and write operations require two cycles
of PRCLK. PRCLK must run continuously at a
minimum frequency of 2 times the cell rate.
I Must be logic low to address chip. Must be low
to enable a read or write operation and should
be stable throughout the cycle.
I If this pin is low, a new address is loaded on the
rising edge of PRCLK for the operation in the
following clock period. If this pin is high and
CS~ is low, a read or a write operation is
executed. The address strobe can stay low for
multiple clock periods. Address strobe cannot
stay high with CS~ low for multiple clock
periods.
I If this pin is low when CS~ is low, the following
cycle is a read operation. If this signal is high
when CS~ is low, the data presented at the end
of the following clock cycle will be written if CS~
is still low on that cycle.
I This signal must be low to enable the data
output for a read cycle. Data bus outputs are
three-stated if this signal is high. The data is
valid between clock edges on a read cycle when
this pin is low. This pin may be connected
directly to ground, if desired.
O Active-low data link channel interrupt output
with open drain.
O Active-low status/counter interrupt with open
drain.
I/O This signal is a 16-bit bidirectional data bus for
I/O read and write data.
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
100046C
Conexant
1-23
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