MAC7200 datasheet(214/976 Pages) FREESCALE

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Nexus Implementation

MAC7200 Microcontroller Family Reference Manual, Rev. 2

136

Freescale Semiconductor

•No cost

•

Already implemented for the ARM9 core

•

Supported by Metroworks tools

11.3.1

Nexus Port Replacement

The selection between the Primary and Secondary Nexus ports will be done via an external pin (See

Section 2.2, “MCU Hardware Configuration Summary”) latched at RESET in order to alleviate the need

for the development system to write into a memory-mapped register. The Primary and Secondary ports are

defined as follows:

11.3.2

TAP Controller Encodings

The following table lists the JTAG TAP controller IR register encodings used on the MAC72xx.

Table 11-7. Nexus Port Assignments

Nexus Pin

Primary Port

Secondary Port

EVTI

PA9

PC3

MCKO

PB0

PC4

EVTO

PB1

PC5

MSEO

PB2

PC6

RDY

PB3

PC7

MDO[0]

PG2

PC8

MDO[1]

PG3

PC9

MDO[2]

PG4

PC10

MDO[3]

PB9

PC11

MDO[4]

PB11

PC12

MDO[5]

PB13

PC13

MDO[6]

PB14

PC14

MDO[7]

PB15

PC15

Table 11-8. JTAG TAP Controller IR Register Encodings

IR Encoding

Function

Used By

$0 = 0000

EXTEST

ARM9

$1 = 0001

Unused

$2 = 0010

SCAN_N

ARM7/ARM9

$3 = 0011

SAMPLE/PRELOAD

ARM9

$4 = 0100

RESTART

ARM7/ARM9

$5 = 0101

CLAMP

ARM920T

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