
O
UTREACH
PCI/PMC E
XPANSION
S
YSTEM
U
SER
’
S
M
ANUAL
C
URTISS
-W
RIGHT
C
ONTROLS
E
MBEDDED
C
OMPUTING
1-10
809524 R
EVISION
D F
EBRUARY
2009
S
ERIAL
EEPROM
A serial EEPROM provides basic configuration details to the 21554
PCI-to-PCI Bridge device such as subsystem vendor ID (“D4D4”) and subsystem device ID
(“0605”). The configuration details can be programmed by the host card and read by the
21554 after power-up or card reset. Refer to Chapter 4 of this manual and Appendix A of the
V8 Foundation Firmware User’s Manual (808006) for more information.
LED
The PMC-605 has a green power-on LED that is software-controllable via the Local Control
and Status Register (LCSR). After Power up or reset, the LED will be initially illuminated. The
LED is extinguished when the PMC605 is successfully initialized and its diagnostics passed
by FF/W.
R
EGISTERS
The Local Control and Status Register (LCSR) is a byte-wide register residing within the
address space defined by the PCI Expansion ROM Base Address set within the 21554 PCI-to-
PCI Bridge device.
The bit definitions of the LCSR are as described in Table 1.2.
T
ABLE
1.2:
Local Control and Status Register (LCSR)
D7
D6
D5
D4
D3
D2
D1
D0
Not Used
Not Used
Host INTA#
Enable
LED Control
Arbiter Mode
Arbiter
Status
Clock Source
Termina-
tion Status
Bit
Name
Description
R/W
@ Reset
D7
N/A
N/A
X
X
D6
N/A
N/A
X
X
D5
Host INTA# Enable
1 = Host INTA# is enabled
0 = Host INTA# is disabled
R/W
0
D4
LED Control
1 = LED On
0 = LED Off
R/W
1
D3
Arbiter Mode
1 = Serial Arbitration
0 = Parallel Arbitration
R
As per backplane
configuration
D2
Arbiter Status
1 = Arbiter Disabled
0 = Arbiter Enabled
R
As per backplane
configuration
D1
Clock Source
1 = Clock Source Disabled
0 = Clock Source Enabled
R
As per backplane
configuration
D0
Termination Status
1 = Termination Disabled
0 = Termination Enabled
R
As per backplane
configuration
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