s5935qrc Applied Micro Circuits Corporation (AMCC), s5935qrc Datasheet - Page 90

• Manufacturer Part Number: s5935qrc
• Description: Pci Product
• Manufacturer: Applied Micro Circuits Corporation (AMCC)

S5935 – PCI Product
ADD-ON CONTROLLED BUS MASTER
READ TRANSFER COUNT REGISTER
(MRTC)
Figure 38. Add-On Controlled Bus Master Read Transfer Count Register
90
Register Name
Add-On
Address Offset
Power-up value
Attribute
Size
DS1527
31
Master Read Transfer Count
5Ch
00000000h
Read/Write
32 bits
00
26
25
This register is only accessible when Add-On initiated
bus mastering is enabled.
The master read transfer count register is used to con-
vey to the PCI controller the actual number of bytes
that are to be transferred. The value in this register is
decremented with each bus master PCI read opera-
tion until the transfer count reaches zero. Upon
reaching zero, the transfer operation ceases and an
interrupt may be optionally generated to either the PCI
or Add-On bus interface. Transfers which are not
whole multiples of DWORDs in size result in a partial
word ending cycle. This partial word ending cycle is
possible since all bus master transfers for this control-
ler are required to begin on a DWORD boundary.
Revision 1.02 – June 27, 2006
AMCC Confidential and Proprietary
0
Bit
Value
Transfer Count
in Bytes (R/W)
Reserved = 0's (RO)
Data Book