PM5371TUDX
DATA SHEET
PMC-920525
ISSUE 6
SONET/SDH TRIBUTARY UNIT CROSS CONNECT
Pin Name Type
Pin Function
No.
ODEB
Input
1
The active low open drain enable (ODEB) signal
configures the DOUTL and DOUTR output buses as
open drain outputs when low. When ODEB is high,
the DOUTL and DOUTR output buses are configured
as normal outputs. The ODEB input has an integral
pull up resistor.
PAGE
Input
41
The page select (PAGE) signal selects the connection
memory pages that are used to control connections
within the TUDX. When PAGE is low, connection
memory page 0 of each switching element is used.
When PAGE is high, connection memory page 1 of
each switching element is used. The PAGE input is
sampled on the rising edge of SCLK. Internally, a
change in the active connection memory page is held
off until the next switching frame boundary (a delay of
up to approximately 14 us). While such a page swap
is pending, accesses to the connection memory by
the microprocessor should be avoided. Such a
pending page swap results in a connection memory
busy indication which can be polled.The PAGE input
has an integral pull down resistor.
MBEB
CS1B
Input
Input
105 The active low Motorola bus enable (MBEB) signal
configures the TUDX for Motorola bus mode where
the RDB/E signal functions as E, and the WRB/RWB
signal functions as RWB. When MBEB is high, the
TUDX is configured for Intel bus mode where the
RDB/E signal functions as RDB. The MBEB input has
an integral pull up resistor.
17
The active low chip select #1 (CS1B) signal is low
during TUDX register accesses.
If CS1B and CS2B are not required (i.e., registers
accesses are controlled using the RDB and WRB
signals only), CS1B and CS2B must be connected to
an inverted version of the RSTB input.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
17
PMC [ PMC-SIERRA, INC ]
