Circuit Descriptions
4-2
© Copyright ARM Limited 1999. All rights reserved.
4.1
The header card circuit board
The header card is a 4-layer board and consists of:
•
the ARM710T processor
•
a phase-locked loop (PLL) clock generation chip
•
external clock input
•
logic analyzer, Multi-ICE, and EmbeddedICE connectors.
4.1.1
Processor in PGA
The ARM710T processor is supplied in a 299-pin pin grid array (PGA) package.
A number of inputs are tied to default values through resistors. These are listed in
Table 4-1.
Table 4-1 Values of tied inputs
ARM710T signal names
Value
nFIQ
HIGH
nIRQ
HIGH
CPA
HIGH
CPB
HIGH
DSEL
LOW
SDOUTBS
LOW
BREAKPT
LOW
DBGRQ
LOW
EXTERN[1:0]
LOW
CPDBE
LOW
DBGEN
HIGH
nTRST
HIGH
TCK
HIGH
TMS
HIGH
TDI
HIGH