TSI148-133CL IDT, Integrated Device Technology Inc, TSI148-133CL Datasheet - Page 329

• Manufacturer Part Number: TSI148-133CL
• Description: IC PCI-VME BRIDGE 456PBGA
• Manufacturer: IDT, Integrated Device Technology Inc
• Series: Tsi148&Trade;r

Specifications of TSI148-133CL

• Applications: PCI-to-VME Bridge
• Interface: PCI
• Voltage - Supply: 3.3V
• Package / Case: 456-PBGA
• Mounting Type: Surface Mount
• Package Type: BGA
• Rad Hardened: No
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 800-1906

Tsi148 PCI/X-to-VME Bus Bridge User Manual
80A3020_MA001_13
Table 137
Table 137: DCTL VBOT Encoding
PBKS (PCI/X Block Size): This field is used to control the PCI/X bus block size when the
source is the PCI/X bus. The encoding of this field is shown in
Table 138: DCTL PBKS Encoding
PBOT (PCI/X Back-off Timer): The back-off timer determines how long the DMA waits
before requesting the next block of data. This field controls the internal data flow between the
DMA controller and the PCI/X Master. The DMA does not attempt to read the next block
until after the Back-off Timer has expired.
PBKS
000b
001b
010b
011b
100b
101b
110b
111b
VBOT
010b
100b
101b
000b
001b
011b
110b
111b
shows the encoding for this field.
Transfer Size
Bytes
1024
2048
4096
128
256
512
32
64
Back-off Time
16 s
32 s
64 s
0 s
1 s
2 s
4 s
8 s
Table
10. Registers > Register Map
138.
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