PNX1300EH NXP Semiconductors, PNX1300EH Datasheet - Page 270
PNX1300EH
Manufacturer Part Number
PNX1300EH
Description
Manufacturer
NXP Semiconductors
Datasheet
1.PNX1300EH.pdf
(548 pages)
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PNX1300/01/02/11 Data Book
• A JTAG controller on the TriMedia processor
18.3.1
Table 18-2. MMIO Register Assignments
PNX1300 has two JTAG data registers and one JTAG
control register (see
number a JTAG instructions to manipulate those regis-
ters.
data and control registers. The addresses are offsets
from MMIO_BASE. All references to instruction and data
registers below are JTAG instructions and data registers
and not TriMedia instruction or data registers.
• Two 32-bit data registers, JTAG_DATA_IN and
18-4
Figure 18-3. Additional JTAG data registers and control register
the TriMedia JTAG controller. The interface module
may be a PC plug-in board.
This module may transfer data from and to the host
computer in bit-serial or word-parallel fashion. It
transfers data from and to the JTAG registers on a
TriMedia processor in bit-serial fashion in accor-
dance with the IEEE 1149.1 standard. The JTAG
interface module connects to a 4-pin JTAG connec-
tor on a TriMedia board which provides a path to the
JTAG pins on a TriMedia processor. It is the respon-
sibility of the interface module to scan data in and out
of the TriMedia processor into its internal buffers and
make them available to the host computer.
which provides a bridge between the external
JTAG TAP and the internal system.
The controller transfers data from/to the TAP to/from
its scannable registers asynchronous to the internal
system clock. A monitor running on a TriMedia pro-
cessor and the debugger front-end running on a host
computer exchange data via JTAG by reading/writing
the MMIO registers reserved for this purpose, includ-
ing a control register used for the handshake.
JTAG_DATA_OUT in MMIO space. Both registers
Table 18-2
MMIO Offset
0x 10 3800
0x 10 3804
0x 10 3808
JTAG Instruction and Data Registers
lists the MMIO addresses of the JTAG
from
TDI
Figure
PRELIMINARY SPECIFICATION
18-3) in MMIO space and a
31
7
unused bits
31
JTAG_CTRL
JTAG_DATA_OUT
JTAG_DATA_OUT
JTAG_DATA_IN
JTAG Register
JTAG_DATA_IN
JTAG_CTRL
3
sleepless
bit
2
.
0
0
• An 8-bit control register JTAG_CTRL in MMIO
• Two
can be connected in between TDI and TDO like the
standard Bypass and Boundary Scan registers of
JTAG (not shown in
The JTAG_DATA_IN register can be read or written
to via the JTAG port. The JTAG_DATA_OUT register
is read-only via the JTAG port, so that scanning out
JTAG_DATA_OUT is non-destructive.
The JTAG_DATA_IN and JTAG_DATA_OUT are
readable/writable from the TriMedia processor via
the usual load/store operations.
space. The JTAG_CTRL register is used for hand-
shake between a debug monitor running on a TriMe-
dia and a debugger front-end running on a host.
JTAG_CTRL.ofull
JTAG_DATA_OUT has valid data to be scanned out.
On power-on reset of the TriMedia processor,
JTAG_CTRL.ofull = ‘0’. JTAG_CTRL.ofull is both
readable and writable via JTAG tap. Writing 0 to
JTAG_CTRL.ofull via JTAG is a ‘remember’ opera-
tion, i.e., JTAG_CTRL.ofull retains its previous state.
Writing a ‘1’ to JTAG_CTRL.ofull via JTAG is a ‘clear’
operation, i.e., JTAG_CTRL.ofull becomes ‘0’.
JTAG_CTRL.ifull
JTAG_DATA_IN register is empty. JTAG_CTRL.ifull
= 1 means that JTAG_DATA_IN has valid data and
the debug monitor has not yet copied it to its private
area. On power-on reset of the TriMedia processor,
JTAG_CTRL.ifull = 0. JTAG_CTRL.ifull is readable
and
JTAG_CTRL.ifull via JTAG is a remember operation,
i.e., JTAG_CTRL.ifull retains it previous state. Writ-
ing a ‘1’ to JTAG_CTRL.ifull posts an interrupt on
hardware line 18.
The peripheral blocks on a TriMedia processor may
enter a ‘power down’ state to reduce power con-
sumption. The JTAG_CTRL.sleepless bit determines
if the JTAG block participates in a power down state.
In the power-on RESET state, JTAG_CTRL.sleep-
less bit is ‘1’ meaning the JTAG block does not
power down. It can be read and written to by the Tri-
Media processor via load/store operations and by the
debugger front-end running on a host by scan in/out.
JTAG_OFULL_OUT.
ifull
1
writable
virtual
ofull
0
registers,
via
Figure
=
=
JTAG.
The
Philips Semiconductors
‘0’
TDO
To
18-3).
JTAG_IFULL_IN
‘1’
first
means
Writing
virtual
means
a
that
register
‘0’
and
that
the
to
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