ds21ft40 Maxim Integrated Products, Inc., ds21ft40 Datasheet - Page 17

• Manufacturer Part Number: ds21ft40
• Description: Ds21ft40 Four X Three 12 Channel E1 Framer
• Manufacturer: Maxim Integrated Products, Inc.

RECEIVE SIDE PINS
Signal Name:
Signal Description:
Signal Type:
2.048 MHz clock that is used to clock data through the receive side framer.
Signal Name:
Signal Description:
Signal Type:
Received NRZ serial data. Updated on rising edges of RCLK when the receive side elastic store is
disabled. Updated on the rising edges of RSYSCLK when the receive side elastic store is enabled.
Signal Name:
Signal Description:
Signal Type:
An extracted pulse, one RCLK wide, is output at this pin which identifies either frame or CAS/CRC
multiframe boundaries. If the receive side elastic store is enabled, then this pin can be enabled to be an
input at which a frame or multiframe boundary pulse synchronous with RSYSCLK is applied.
Signal Name:
Signal Description:
Signal Type:
An extracted pulse, one RSYSCLK wide, is output at this pin which identifies multiframe boundaries. If
the receive side elastic store is disabled, then this output will output multiframe boundaries associated
with RCLK.
Signal Name:
Signal Description:
Signal Type:
1.544 MHz or 2.048 MHz clock. Only used when the elastic store function is enabled. Should be tied
low in applications that do not use the elastic store. Can be burst at rates up to 8.192 MHz.
Signal Name:
Signal Description:
Signal Type:
Sampled on the falling edge of RCLK for data to be clocked through the receive side framer. RPOS and
RNEG can be tied together for an NRZ interface. Connecting RPOS to RNEG disables the bipolar
violation monitoring circuitry.
Signal Name:
Signal Description:
Signal Type:
Sampled on the falling edge of RCLK for data to be clocked through the receive side framer. RPOS and
RNEG can be tied together for an NRZ interface. Connecting RPOS to RNEG disables the bipolar
violation monitoring circuitry.
RCLK
Receive Clock Input
Input
RSER
Receive Serial Data
Output
RSYNC
Receive Sync
Input /Output
RMSYNC
Receive Multiframe Sync
Output
RSYSCLK
Receive System Clock
Input
RPOS
Receive Positive Data Input
Input
RNEG
Receive Negative Data Input
Input
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DS21FT40