GD82559ER — Networkin g Silicon
Symbol | Type | Name and Function | |
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| Cycle Frame. The cycle frame signal is driven by the current master | |
FRAME# | S/T/S | to indicate the beginning and duration of a transaction. FRAME# is | |
asserted to indicate the start of a transaction and | |||
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| the final data phase. | |
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| Initiator Ready. The initiator ready signal indicates the bus master’s | |
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| ability to complete the current data phase and is used in conjunction | |
IRDY# | S/T/S | with the target ready (TRDY#) signal. A data phase is completed on | |
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| any clock cycle where both IRDY# and TRDY# are sampled asserted | |
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| (low) simultaneously. | |
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| Target Ready. The target ready signal indicates the selected device’s | |
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| ability to complete the current data phase and is used in conjunction | |
TRDY# | S/T/S | with the initiator ready (IRDY#) signal. A data phase is completed on | |
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| any clock cycle where both IRDY# and TRDY# are sampled asserted | |
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| (low) simultaneously. | |
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| Stop. The stop signal is driven by the target to indicate to the initiator | |
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| that it wishes to stop the current transaction. As a bus slave, STOP# is | |
STOP# | S/T/S | driven by the 82559ER to inform the bus master to stop the current | |
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| transaction. As a bus master, STOP# is received by the 82559ER to | |
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| stop the current transaction. | |
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| Initialization Device Select. The initialization device select signal is | |
IDSEL | IN | used by the 82559ER as a chip select during PCI configuration read | |
and write transactions. This signal is provided by the host in PCI | |||
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| systems. | |
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| Device Select. The device select signal is asserted by the target once | |
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| it has detected its address. As a bus master, the DEVSEL# is an input | |
DEVSEL# | S/T/S | signal to the 82559ER indicating whether any device on the bus has | |
been selected. As a bus slave, the 82559ER asserts DEVSEL# to | |||
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| indicate that it has decoded its address as the target of the current | |
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| transaction. | |
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| Request. The request signal indicates to the bus arbiter that the | |
REQ# | T/S | 82559ER desires use of the bus. This is a | |
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| every bus master has its own REQ#. | |
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| Grant. The grant signal is asserted by the bus arbiter and indicates to | |
GNT# | IN | the 82559ER that access to the bus has been granted. This is a point- | |
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INTA# | O/D | Interrupt A. The interrupt A signal is used to request an interrupt by | |
the 82559ER. This is an active low, level triggered interrupt signal. | |||
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SERR# | O/D | System Error. The system error signal is used to report address | |
parity errors. When an error is detected, SERR# is driven low for a | |||
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| single PCI clock. | |
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| Parity Error. The parity error signal is used to report data parity errors | |
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| during all PCI transactions except a Special Cycle. The parity error pin | |
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| is asserted two clock cycles after the error was detected by the device | |
PERR# | S/T/S | receiving data. The minimum duration of PERR# is one clock for each | |
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| data phase where an error is detected. A device cannot report a parity | |
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| error until it has claimed the access by asserting DEVSEL# and | |
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| completed a data phase. | |
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8 | Datasheet |