ds21ft40 Maxim Integrated Products, Inc., ds21ft40 Datasheet - Page 16

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

2. DS21FT44 PIN FUNCTION DESCRIPTION
TRANSMIT SIDE PINS
Signal Name:
Signal Description:
Signal Type:
A 2.048 MHz primary clock. Used to clock data through the transmit side formatter.
Signal Name:
Signal Description:
Signal Type:
Transmit NRZ serial data. Sampled on the falling edge of TCLK when the transmit side elastic store is
disabled. Sampled on the falling edge of TSYSCLK when the transmit side elastic store is enabled.
Signal Name:
Signal Description:
Signal Type:
1.544 MHz or 2.048 MHz clock. Only used when the transmit side elastic store function is enabled.
Should be tied low in applications that do not use the transmit side elastic store. Can be burst at rates up
to 8.192 MHz.
Signal Name:
Signal Description:
Signal Type:
A pulse at this pin will establish either frame or multiframe boundaries for the transmit side. This pin can
also be programmed to output either a frame or multiframe pulse. Always synchronous with TCLK.
Signal Name:
Signal Description:
Signal Type:
Only used when the transmit side elastic store is enabled. A pulse at this pin will establish either frame or
multiframe boundaries for the transmit side. Should be tied low in applications that do not use the
transmit side elastic store. Always synchronous with TSYSCLK.
Signal Name:
Signal Description:
Signal Type:
Updated on the rising edge of TCLK with the bipolar data out of the transmit side formatter. Can be
programmed to source NRZ data via the Output Data Format (TCR1.7) control bit.
Signal Name:
Signal Description:
Signal Type:
Updated on the rising edge of TCLK with the bipolar data out of the transmit side formatter.
TCLK
Transmit Clock
Input
TSER
Transmit Serial Data
Input
TSYSCLK
Transmit System Clock
Input
TSYNC
Transmit Sync
Input /Output
TSSYNC
Transmit System Sync
Input
TPOS
Transmit Positive Data Output
Output
TNEG
Transmit Negative Data Output
Output
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DS21FT40