PRELIMINARY
PM4318 OCTLIU
DATASHEET
PMC- 2001578
ISSUE 3
OCTAL E1/T1/J1 LINE INTERFACE DEVICE
The boundary scan register allows testing of board inter-connectivity. The boundary scan register
consists of a shift register placed in series with device inputs and outputs. Using the boundary
scan register, all digital inputs can be sampled and shifted out on primary output, TDO. In
addition, patterns can be shifted in on primary input, TDI, and forced onto all digital outputs.
12.8.1 TAP Controller
The TAP controller is a synchronous finite state machine clocked by the rising edge of primary
input, TCK. All state transitions are controlled using primary input, TMS. The finite state machine
is described below.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
204
PMC [ PMC-SIERRA, INC ]
