IDT Tsi310TM, User Manual

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6. Signals and Pinout 154
Tsi310 User Manual
80B6020_MA001_05
6.3 Secondary Interface Signals
Table 14: Secondary Interface Signals
Signal Name I/O Width Description
S_ACK64# I/O 1 Acknowledge 64-Bit Transfer: Asserted by the currently addressed
target on the secondary bus to indicate its willingness to transfer data
using 64 bits.
S_AD(63:00) I/O 64 Multiplexed Address and Data: These signals are the 64-bit
multiplexed address and data bus, shared by other devices on the
secondary bus. During a transaction, this bus contains the physical
bus address, attributes, or data, or it may be reserved.
S_C/BE(7:0)# I/O 8 Multiplexed Bus Command and Byte Enables: During a transaction,
these eight bits define the bus command, attributes, or byte enables
for the transfer. These signals are shared with other agents on the
secondary bus and at times may be reserved.
S_CLK I 1 Clock: Received by the bridge and provides timing for all operations
on the secondary interface.
S_DEVSEL# I/O 1 Device Select: Asserted by the target on the secondary bus that
decoded the address of the current transaction as being within one of
its address ranges.
S_DEVSEL# is monitored by the bridge when performing a secondary
bus transaction on behalf of a primary bus master.
S_DEVSEL# is driven by the bridge when a secondary bus master is
performing a transaction on the secondary bus intended for a primary
bus slave.
S_FRAME# I/O 1 Cycle Frame: Defines the beginning and duration of each secondary
bus transaction and is controlled by the initiator of the operation.
S_FRAME# is driven by the bridge when performing a secondary bus
transaction on behalf of a primary bus master.
S_FRAME# is monitored by the bridge when a secondary bus master
is performing a transaction on the secondary bus.
S_GNT1REQ# O 1 Grant 1: This is a dual-purpose signal:
• When the Tsi310 internal arbiter is enabled this signal is used as a
grant output, and is activated by the bridge to grant the use of the
secondary bus to the master who requested the use with the
S_REQ1GNT# signal.
• When the Tsi310 internal arbiter is disabled, this signal is used by
the bridge as its request output signal.
S_GNT2# - S_GNT6# O 5 Grants 2-6: Driven by the bridge's internal arbiter to grant usage of the
secondary bus to the master that activated the corresponding request
signal.