CHAPTER 22:Media Local Bus Interface (MediaLB)
876
S6J3200 Series Hardware Manual Document Number: 002-04852 Rev. *G
[bit28:22] TH[6:0] : Buffer Threshold
TH[6:0] sets the threshold of the local channel buffer. The buffer threshold is set in units of 2 quadlets.
This bit is used to determine whether a transmission/reception service request should be issued.
TH[6:0]
Description
0x00
When TH[6:0] is 0x00, an reception service request is generated if the buffer is full and a transmission
service request is generated when the buffer is empty.
0x01
Threshold = 2 quadlets
0x02
Threshold = 4 quadlets
...
...
0x7F
Threshold = 254 quadlets
[bit21:19] read0 : -
[bit18:13] BD[5:0] : Buffer Depth
BD[5:0] sets the depth of the local channel buffer. The depth is set in units of 4 quadlets.
BD[5:0]
Description
0x00
Depth= 4 quadlets
0x01
Depth= 8 quadlets
0x02
Depth= 12 quadlets
...
...
0x3F
Depth= 256 quadlets
[bit12:6] read0 : -
[bit5:0] SA[5:0] : Buffer Start Address
SA[5:0] sets the start address of the local channel buffer.
SA[5:0]
Description
0x00
RAM Start Address offset of 0 quadlets
0x01
RAM Start Address offset of 4 quadlets
0x02
RAM Start Address offset of 8 quadlets
...
...
0x3F
RAM Start Address offset of 252 quadlets
Note:
−
The initial value of SA[5:0] is n*4, where n is the channel number (0,1,2 ... 15). The initial value of
SA[5:0] for Channel 0 is 0x0, for Channel 1 is 0x4, for Channel 2 is 0x8 and so on.
Содержание S6J3200 Series
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