DS21348 Dallas Semiconducotr, DS21348 Datasheet - Page 14

• Manufacturer Part Number: DS21348
• Description: 3.3V E1/T1/J1 Line Interface
• Manufacturer: Dallas Semiconducotr

PIN DESCRIPTIONS IN SERIAL PORT MODE
Pin Numbering)
ACRONYM
DS21348T
BPCLK
HRST*
MCLK
RCLK
OCES
PBEO
ICES
BIS0/
INT*
BIS1
PIN #
CS*
NA
40
41
42
43
44
PIN
32/
33
31
29
23
30
24
40
Table 4-3b
1
8
9
-
DS21348G
PIN#
B3
A3
B2
A2
A1
I/O
O
O
O
O
I
I
I
I
I
I
I
DESCRIPTION
Bus Interface Select Bits 0 & 1. Used to select bus interface option.
See Table 4-1 for details.
Back Plane Clock. A 16.384MHz, 8.192MHz, 4.096MHz, or
2.048MHz clock output that is referenced to RCLK selectable via
CCR5.7 and CCR5.6. In hardware mode, defaults to 16.384 MHz
output.
Chip Select. Must be low to read or write to the device. CS* is an
active low signal.
Hardware Reset. Bringing HRST* low will reset the DS21348
setting all control bits to their default state of all zeros.
Input Clock Edge Select. Selects whether the serial port data input
(SDI) is sampled on rising (ICES =0) or falling edge (ICES = 1) of
SCLK.
Interrupt [INT*] Pin 23. Flags host controller during conditions
and change of conditions defined in the Status Register. Active low,
open drain output.
Master Clock. A 2.048MHz (±50ppm) clock source with TTL
levels is applied at this pin. This clock is used internally for both
clock/data recovery and for jitter attenuation. Use of a T1 1.544
MHz clock source is optional.
See Note 2.
Not Assigned. Should be tied low.
Output Clock Edge Select. Selects whether the serial port data
output (SDO) is valid on the rising (OCES = 1) or falling edge
(OCES = 0) of SCLK.
PRBS Bit Error Output. The receiver will constantly search for a
2
Remains high if out of synchronization with the PRBS pattern. Goes
low when synchronized to the PRBS pattern. Any errors in the
received pattern after synchronization will cause a positive going
pulse (with same period as E1 or T1 clock) synchronous with
RCLK. PRBS bit errors can also be reported to the ECR1 and ECR2
registers by setting CCR6.2 to a logic 1.
Receive Clock. Buffered recovered clock from the line.
Synchronous to MCLK in absence of signal at RTIP and RRING.
15
-1 or a 2
I/O
O
I
I
I
I
20
-1 PRBS depending on the ETS bit setting (CCR1.7).
14 of 73
Port Mode
RCLK
TNEG
TCLK
Serial
TPOS
NA
(Sorted by Pin Name, DS21348T