
PRELIMINARY
INVERSE MULTIPLEXING OVER ATM
PM7340 S/UNI-IMA-8
DATA SHEET
PMC-2001723
ISSUE 3
INVERSE MULTIPLEXING OVER ATM
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
25
Pin Name
Type
Pin
No.
Function
TSOC
Input
H19
The
Transmit Start of Cell
(TSOC) is an active high
signal that marks the first word of the cell on the
TDAT[15:0] bus.
The TSOC input is sampled on the rising edge of
TCLK.
TDAT[15]
TDAT[14]
TDAT[13]
TDAT[12]
TDAT[11]
TDAT[10]
TDAT[9]
TDAT[8]
TDAT[7]
TDAT[6]
TDAT[5]
TDAT[4]
TDAT[3]
TDAT[2]
TDAT[1]
TDAT[0]
Input
H21
H20
F19
G22
G21
F22
G20
F21
E22
C20
E21
C22
E20
D21
C21
B22
The
Transmit Cell Data
(TDAT[15:0]) signals carry
the ATM cell octets that are transferred to the
internal cell buffer. The TDAT[15:0] signals are
considered valid only when the TENB signal is
asserted low. When this interface is operating in 8-
bit mode, only TDAT[7:0] is used.
The TDAT[15:0] input bus is sampled on the rising
edge of TCLK.
TPRTY
Input
D20
The
Transmit Parity
(TPRTY) signal provides the
parity (programmable for odd or even parity) of the
TDAT[15:0] bus. The TPRTY signal is valid only
when valid data is transferring as indicated by the
TENB signal asserted low. When this interface is
operating in 8-bit mode, this signal provides the
parity of TDAT[7:0].
A parity error is indicated by a status bit and a
maskable interrupt.
The TPRTY input signal is sampled on the rising
edge of TCLK.