s1r72805 Epson Electronics America, Inc., s1r72805 Datasheet - Page 7

• Manufacturer Part Number: s1r72805
• Description: Ieee1394 Link/transaction Usb1.1 Controller
• Manufacturer: Epson Electronics America, Inc.

• Direct Addressing makes it possible to access all the RAM area from the CPU.
• For RxStreamArea and TxStreamArea, Hardware DMA is possible to IDE Interface.
• HW_PageTableArea (for 24 pages), HW_RxHeaderArea and HW_TxHeaderArea respectively secure areas
• RxHeaderArea, RxORBArea, TxORB, TxStreamArea and RxStreamArea have become ring buffers and
• TxStreamArea and RxStreamArea can be overlapped and can be used as a single StreamArea.
• Post**Ptr and Used**Ptr of RxHeaderArea, RxORBArea, TxStreamArea or RxStreamArea monitor how each
• When the above functions are controlled from the TRANS & SBP2 control block, PageTable Fetch in SBP-2
When USB is used in this area, only 2KB (0x011800-0x011FFF) in the latter half is secured for USB-FIFO and
other areas can be used for general purposes in the firm but compete with USB operation at the time of access.
Rev.1.0
for a header as the Hardware areas. Firmware can independently use both the RxORB and TxORB areas.
guarantee data among areas in the Hardware at the times of receiving 1394 and of executing IDE DMA. (The
sizes of respective ring buffer areas can be changed if set by RxORBAreaStart, TxHeaderAreaStart,
TxStreamAreaStart, TxStreamAreaEnd or RxStreamAreaStart in the internal register.)
area is used. (Rx of 1394 monitors the both free capacities and controls busy_A, B and X in the Hardware.)
and data transfer can be operated by the Hardware.
Memory Map of 1394/USB Buffer Area
TxHeaderArea
TxAreaStart
0x010000
0x0100C0
0x0100E0
0x010100
0x011FFF
+ 0x20
+ 0x40
used Asyncronouse only
AsyTxPktHdr 0
AsyTxPktHdr 1
TxHeaderArea (2 Headers)
HW_PageTableArea
HW_RxHeaderArea
HW_TxHeaderArea
RxHeaderArea
RxStreamArea
TxStreamArea
RxORBArea
(RingBuffer)
(RingBuffer)
TxORBArea
(RingBuffer)
(RingBuffer)
(RingBuffer)
NotUsed
8KB
EPSON
TxAreaStart
+ 0x20
+ 0x30
+ 0x40
used Isocronouse
(RxHeaderAreaStart)
RxORBAreaStart
TxHeaderAreaStart
(TxHeaderAreaStart + 0x0040)
TxStreamAreaStart
TxStreamAreaEnd
RxStreamAreaStart
IDE->1394 DMA Area
1394->IDE DMA Area
AsyTxPktHdr 0
IsoTxPktHdr 0
IsoTxPktHdr 1
S1R72805
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