TI380PCIA Datasheet, PDF (11/40 Pages) Texas Instruments – PCI BUS INTERFACE FOR THE TI380 COMMPROCESSORS

TI380PCIA
PCI BUS INTERFACE FOR THE TI380 COMMPROCESSORS™
SPWS035 – JUNE 1997
Terminal Functions (Continued)
TERMINAL
NAME
NO.
I/O†
DESCRIPTION
PCI INTERFACE (CONTINUED)
TRDY
Target ready. TRDY indicates the target agent’s (that is, the TI380PCIA’s) ability to complete the current
data phase of the transaction. If a data phase is completed on any clock, both TRDY and IRDY are
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I / O sample-asserted. During a read, TRDY indicates that valid data is present on AD31 – AD00. During a
write, TRDY indicates that the target is prepared to accept data. Wait cycles are inserted until both IRDY
and TRDY are asserted together.
SERIAL EEPROM INTERFACE
EDIO
EEPROM data input / output is a bidirectional signal used to transfer data into or out of the EEPROM
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I / O memory. Note I2C memory devices typically require a pullup resistor to VCC on this line. This is an
open-drain output. If the optional EEPROM is not present, EDIO should be tied high.
EDC
EEPROM clock signal used to synchronize all data in and data out of the memory. I2C memory devices
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O typically require a pullup resistor to VCC on this line. If the optional EEPROM is not present, EDC should
be tied low.
† _{I = in, O = out}
‡ _{The TI380PCIA SIF pin names correspond to a subset of the system interface pins on a TI380C2x§. See the TI380C2x§ data sheets for more}
information on individual pins. Like-named pins on the TI380PCIA and TI380C2x§ system interfaces are intended to be connected to each
other.
§ _{TI380C3x devices can be used with TI380PCIA in the same way as TI380C2x devices.}
¶ _{Typical bit-ordering for Intel™ and Motorola™ processor buses}
# _{The signal connecting this pin to the TI380C2x§ also should be connected to a 4.7-kΩ pullup resistor.}
|| _{The TI380PCIA BIF pin names correspond to a subset of the local memory bus interface pins on a TI380C2x§. Like-named pins on the two}
devices are intended to be connected to each other. Consult the TI380C2x§ data sheets for more information on individual pins.
NOTE 1: The TI380PCIA allows driver software to set SBCLK output to a steady high state. This signal is driven to a steady high state during
power-down operations.
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