XRT83VSH28 Просмотр технического описания (PDF) - Exar Corporation
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XRT83VSH28 Datasheet PDF : 74 Pages
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XRT83VSH28
PRELIMINARY
8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT
REV. P1.0.0
SIGNAL NAME
RXRES1
RXRES0
RCLKE/
µPTS1
BGA
LEAD #
R10
V10
J16
TYPE
DESCRIPTION
I Receive External Resistor Control Pins
Hardware mode Only
These pins are used in the Receive Internal Impedance mode for unique applica-
tions where an accurate resistor can be used to achieve optimal return loss. When
RxRES[1:0] are used, the LIU automatically sets the internal impedance to match
the line build out. For example: if 240Ω is selected, the LIU chooses an internal
impedance such that the parallel combination equals the impedance chosen by
TERSEL[1:0].
"00" = No External Fixed Resistor
"01" = 240Ω
"10" = 210Ω
"11" = 150Ω
NOTE: These pins are internally pulled “Low” with a 50kΩ resistor. This feature is
available in Host mode by programming the appropriate channel register.
I Receive Clock Edge
Hardware Mode
This pin is used to select which edge of the recovered clock is used to update data to
the receiver on the RPOS/RNEG outputs. By default, data is updated on the risinge
edge. To udpdate data on the falling edge, this pin must be pulled "High".
Host Mode
µPTS[2:1] pins are used to select the type of microprocessor to be used for Host
communication.
"00" = 8051 Intel Asynchronous
"01" = 68K Motorola Asynchronous
"11" = MPC8xx Power PC Synchronous
NOTE: This pin is internally pulled “Low” with a 50kΩ resistor.
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