LSI53C040-160QFP LSI, LSI53C040-160QFP Datasheet - Page 49

• Manufacturer Part Number: LSI53C040-160QFP
• Manufacturer: LSI

Specifications of LSI53C040-160QFP

• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Supplier Unconfirmed

2.10.2.5 Loss of BSY/ Interrupt
2.10.3 SFF-8067 Interrupts
2.10.4 Two-Wire Serial Interrupts
A phase mismatch prevents the recognition of REQ/ and removes the
chip from the bus during an initiator send operation. DB0/ through DB7/
and DBP/ will not be driven even though the Assert Data Bus bit is active.
This interrupt is only significant when the LSI53C040 is connected as an
initiator. It may be disabled by clearing the DMA Mode bit.
If the Monitor Busy bit (bit 2) in the
active, an interrupt will be generated if the BSY/ signal is asserted for at
least a bus settle delay (400 ns). This interrupt may be disabled by
resetting the Monitor Busy bit.
The SFF-8067 interface generates two types of interrupts: read interrupts
and write interrupts. The read interrupt notifies the LSI53C040 that the
Fibre Channel device is requesting data. The LSI53C040 microcontroller
core should respond by clearing the interrupt and writing one byte of data
to the RDATA register, which is transferred to the requesting drive. The
write interrupt notifies the LSI53C040 that the drive has written a byte of
data to the interface. The LSI53C040 microcontroller core should
respond by clearing the interrupt and reading the WDATA register. The
Port Control/Status (PCST0/PCST1)
bits [1:0] indicate whether a read or write interrupt has occurred.
An interrupt from the Two-Wire Serial block is caused by one of the
following conditions:
Interrupts
A byte has been transferred (Status register 0xFD01/0xFD03, bit 3)
A Two-Wire Serial bus error (register 0xFD01/0xFD03, bit 4)
The chip is addressed as a slave (register 0xFD01/0xFD03, bit 2)
Note:
It is possible for this interrupt to occur when connected as
a target if another device is driving the phase lines to a
different state.
Mode (MR)
registers (0xFC22/0xFC2A),
register (0xFC02) is
2-31