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Theory of Operation
System Tests (System PV)
Status Bits
BitO
The internal registers olthe LAN IC are loaded with known test values and then are read. If this bitis notsel, it implies that
the LAN IC is operating properly and that the microprocessor can communicate with the LAN IC. If this bit isseI, then the
LAN module is not operational and must be replaced.
Bit 1
The CAM IContent Addressable Memory} bit reports whether the LAN address can be written from the LAN module Static
RAM (SRAM) to the internal memory olthe LAN IC. Also, the CAM bit reports whether the LAN address can be written to
SRAM from the LAN IC. If this bit is not sel, it implies that both the SRAM and the LAN IC internal memory are able to
recognize and store the LAN address. If this bit is sel, then the LAN module is not operational and must be replaced.
Bit 2
If this bit is not sel, then the self-test has detected that the LAN cable is properly connected to the logic analyzer. If this bit
is sel, then the physical connection of the LAN cable must be checked.
Bit 3
If the Termination bit isseI, then the self-test has detected an excessive number of collisions. The most probable cause of
excessive collisions is an improperly terminated LAN cable. Provide a proper termination of the LAN cable according to the
LAN topology being used.
Bit4
The MAC (Media Access Controll bit indicates whether the Media Access Control unit on the LAN IC is functioning. If this
bit is not sel, it implies that both the transmit functions and receive functions of the LAN IC are operating properly. If this bit
is sel, then the LAN module is not able
to
properly transmit and receive packets and must be replaced.
Bit 5
The ENOEC (Encoder/Decoder) bit indicates whether the encoder/decoder internal to the LAN IC is functioning. The
encoder/decoder is the interface between the MAC and the Ethernet transceiver. If this bit is sel, then the ENOEC is not
operating properly and the LAN module must be replaced.
Bit 6
The TRANS (Transceiver, such as Ethernet transceiver) bit indicates whether the circuitry between the LAN IC and the LAN
cable is functioning. If this bit is not set, then the path between the LAN cable and the LAN IC is operating properly. If this
bit isseI, then either the CPU board or the I/O board must be replaced.
Bit 7
Timeout bit If this bit isseI, then bits 4, 5, or 6will also be set Refer to the appropriate bitfar a suggested course of action.
Bit B
The Tx bit indicates whether the transmission portion of the MAC, ENDEC, or TRANS test failed. Therefore, the Tx bit is used
in conjunction with bits 4, 5, and 6. Refer to the appropriate bit far the suggested course of action.
Bit 9
The Rx bit indicates whether the receive portion of the MAC, ENOEC, or TRANS test failed. The Rx bit is used in conjunction
with bits 4, 5, and 6. Refer
to
the appropriate bit for the suggested course of action.
Bit 10
The Parameters bit indicates the integrity of the LAN module self-test parameters. Ilthis bit is not sel, then the parameters
sent to the self-test routine are correct If this bit is set, then
contact your
nearest HP Sales and Service Office.
Bit 11
The E2PROM that is used to hold the Ethernet address, IP address, and gateway address has been corrupted. Ilthis bit is
sel, the LAN module must be replaced.
Bits 12-15
Not Used
8-19
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