A. Board Configuration
ÛZIATECH
98
However, some STD 32 systems define P5 for VBAT (battery backup). If the ZT 8907 is
used in a system that requires P5 to be configured as VBAT, then CT48 should be
removed.
CT #
State
Function
CT48
In
STD 32 connector pin P5 for INTRQ4*
Out
STD 32 connector pin P5 for VBAT
Note:
Do not remove CT48 if resistors RP1 and RP2 are also removed, as when the
ZT 8907 is configured as a STAR SYSTEM temporary master. If you need to operate
the ZT 8907 in this configuration (VBAT operation with RP1 and RP2 removed), contact
Ziatech for assistance.
CT53 (STD Reset Configuration)
By default, the ZT 8907 uses pin P47 on the STD 32 connector for the SYSRESET
signal. SYSRESET is generated by the permanent master in a STAR SYSTEM. To
keep the ZT 8907 from resetting when this signal is present on the backplane,
disconnect the SYSRESET signal by removing CT53.
CT #
State
Function
CT53
†
In
Enable SYSRESET detection (permanent master)
Out
Disable SYSRESET detection
†
Factory default configuration