1. PCI/PCIe TFP Hardware
1.9.1. PCI Bar Mapping
PCI-U
PCI-V2 and PCIe
bar0 = 32-bit register space
bar0 = reserved
bar1 = 8-bit dpram space
bar1 = reserved
bar2 = 32-bit register space
bar3 = 8-bit dpram space
1.9.2. Differences Between Versions -U and New Generation Cards
PCI-U
PCI-V2 and PCIe
Standard oscillator VCXO
TCXO (better holdover)
1pps duty cycle
63 uS
60 uS
Heartbeat (periodic)
duty cycle
Adjustable
square wave
Field program
update
Replace flash
l
Serial port download for early versions of
bc635PCI-V2 and bc637PCI-V2.
l
Through the host PCI(e) bus for later models of
bc635PCI-V2, bc637PCI-V2, and all models of
bc635PCIe, and bc637PCIe.
OCXO option
+12V
+5V
OCXO option
sine wave
square wave
Time at power-on
elapsed
RTC
Time code input
level (AM)
5V to 5V P-P
1V to 8V P-P
Time code output
level (AM)
4V P-P 50 ohm
3V P-P 50 ohm
NV (Restored at
Power-on)
not supported
many parameters restored
Strobe output tim-
ing
1 uS late
on time
bc637 GPS
receiver
Ace III
SKII (Lassen)
Battery disconnect
jumper
No
Yes
DDS (frequency
synthesizer) circuit
No
Yes
Time Code Inputs No
IRIG G, E, XR3 & 2137
Time Code Outputs No
IRIG A, G, E, NASA 36, XR3 & 2137
n
The PCI-V2 and PCIe cards transition through end of year properly, version -U did not.
n
SET CLOCK Command (10 uSec Advance Retard) is not implemented on PCI-V2 or PCIe
design.
n
PCI Special Boot mode is not supported on the PCI-v2 or PCIe design.
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