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CS61880 Datasheet(PDF) 10 Page - Cirrus Logic

Part No. CS61880
Description  OCTAL E1 LINE INTERFACE UNIT
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Maker  CIRRUS [Cirrus Logic]
Homepage  http://www.cirrus.com
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CS61880
10
DS450PP3
3.2 Control
SYMBOL
LQFP
FBGA
TYPE
DESCRIPTION
MCLK
10
E1
I
Master Clock Input
This pin is a free running reference clock that should be
2.048 MHz. This timing reference is used as follows:
- Timing reference for the clock recovery and jitter attenua-
tion circuitry.
- RCLK reference during Loss of Signal (LOS) conditions
- Transmit clock reference during Transmit all Ones (TAOS)
condition
- Wait state timing for microprocessor interface
- When this pin is held “High”, the PLL clock recovery cir-
cuit is disabled. In this mode, the CS61880 receivers
function as simple data slicers.
- When this pin is held “Low”, the receiver paths are pow-
ered down and the output pins RCLK, RPOS, and RNEG
are High-Z.
MODE
11
E2
I
Mode Select
This pin is used to select whether the CS61880 operates in
Serial host, Parallel host or Hardware mode.
Host Mode - The CS61880 is controlled through either a
serial or a parallel microprocessor interface (Refer to HOST
MODE (See Section 13 on page 32).
Hardware Mode - The microprocessor interface is disabled
and the device control/status are provided through the pins
on the device.
NOTE: For serial host mode connect this pin to a resistor
divider consisting of two 10 k
Ω resistors between
VCCIO and GNDIO.
Table 1. Operation Mode Selection
Pin State
OPERATING Mode
LOW
Hardware Mode
HIGH
Parallel Host Mode
VCCIO/2
Serial Host Mode




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