Filter
Top Products
2
STP2002QFP
Sun Microelectronics
Fast Ethernet, Parallel Port, SCSI (FEPS) - STP2002QFP
terface (CEI) for slave and DMA transfers with the SBus (via SBA). The SBA
provides buffering and bus conversion between the SBus and the channel en-
gine interface. Interrupts from the channel engine go directly to the SBus. The
SBA contains no software-accessible registers.
The channel engine interface provides a common interface to the three
channel engines thus reducing verification time. This interface limits the
amount of “awareness” that the SBA has concerning DMA transactions.
The SBA supports only 32-bit programmed I/O on the SBus. There are two
64-byte DMA write buffers, to allow buffered writes. A round-robin arbitra-
tion scheme will be used between the three channel engines.
The SCSI_Channel contains the SCSI DVMA and the FAS366. The SCSI
channel can perform 64-bit SBus DMA transfer. The SCSI DVMA provides
the two 64-byte buffers to transfer data to/from FAS366. The FAS366 allows
for a 16-bit SCSI data path and a throughput of 20 Mbytes/sec. The program-
ming model of the SCSI DVMA follows the DMA2’s SCSI. All programmed
I/O access to the FAS366 is driven by the SCSI DMA.
The Ethernet DMA can perform 64-bit SBus DMA transfers.The Ethernet
DMA has two 2K-byte FIFOs (one for transmit and one for receive). The
transmit portion of the Ethernet DMA can assist in TCP checksum genera-
tion. This requires the entire frame to be loaded into the TxFIFO before the
checksum can be inserted into the frame (that resides in the TxFIFO). The
receive portion of the Ethernet DMA can assist in checking the checksum of
an incoming frame. The receive DMA can also pass incoming frames from
the BigMac (Media Access Conmtroller) before the entire frame has been
buffered in the RxFIFO.
1.4 Technology Information
Technology features of FEPS are as follows:
1.5 Compliance
This part is fully compliant with IEEE 1496 SBus, ANSI SCSI-2 X3T9.2/86-
• 240-pin PQFP
• 112K gates + 4K bytes dual-ported RAM
• 5-V operation only
• 1.5-W maximum power consumption
• 16–25-MHz SBus interface and parallel port, 40-MHz SCSI core, 25-MHz Fast
Ethernet core
• 48-mA SCSI, 16-mA MII direct interconnect-capable drivers