SMC91C100 Datasheet, PDF (33/83 Pages) List of Unclassifed Manufacturers – FEAST Fast Ethernet Controller

I/O SPACE - BANK1
OFFSET
C
NAME
CONTROL REGISTER
TYPE
READ/WRITE
SYMBOL
CTR
HIGH
BYTE
0
RCV_BAD
0
AUTO
RELEASE
0
0
0
0
X
0
X
X
0
LOW
BYTE
LE
CR
TE
ENABLE ENABLE ENABLE
0
0
0
X
EEPROM
SELECT
RELOAD
STORE
X
0
0
0
RCV_BAD When set, bad CRC packets are
received. When clear bad CRC packets do not
generate interrupts and their memory is released.
AUTO RELEASE When set, transmit pages are
released by transmit completion if the transmission
was successful (when TX_SUC is set). In that
case there is no status word associated with its
packet number, and successful packet numbers
are not even written into the TX COMPLETION
FIFO. A sequence of transmit packets will only
generate an interrupt when the sequence is
completely transmitted (TX EMPTY INT will be
set), or when a packet in the sequence
experiences a fatal error (TX INT will be set).
Upon a fatal error TXENA is cleared and the
transmission sequence stops. The packet number
that failed is the present in the FIFO PORTS
register, and its pages are not released, allowing
the CPU to restart the sequence after corrective
action is taken.
LE ENABLE Link Error Enable. When set it
enables the LINK_OK bit transition as one of the
interrupts merged into the EPH INT bit. Defaults
low (disabled). Writing this bit also serves as the
acknowledge by clearing previous LINK interrupt
conditions.
CR ENABLE Counter Roll over Enable. When
set it enables the CTR_ROL bit as one of the
interrupts merged into the EPH INT bit. Defaults
low (disabled).
TE ENABLE Transmit Error Enable. When set it
enables Transmit Error as one of the interrupts
merged into the EPH INT bit. Defaults low
(disabled). Transmit Error is any condition that
clears TXENA with TX_SUC staying low as
described in the EPHSR register.
EEPROM SELECT This bit allows the CPU to
specify which registers the EEPROM RELOAD or
STORE refers to. When high, the General
Purpose Register is the only register read or
written. When low, RELOAD reads Configuration,
Base and Individual Address, and STORE writes
the Configuration and Base registers.
RELOAD When set, it will read the EEPROM and
update relevant registers with its contents. Clears
upon completing the operation.
STORE When set, stores the contents of all
relevant registers in the serial EEPROM. Clears
upon completing the operation.
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