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| 型號(hào)： | PM7366 |
| 廠商： | PMC-SIERRA INC |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | FRAME ENGINE AND DATA LINK MANAGER |
| 中文描述： | 8 CHANNEL(S), 52M bps, SERIAL COMM CONTROLLER, PBGA256 |
| 封裝： | BGA-256 |
| 文件頁(yè)數(shù)： | 194/286頁(yè) |
| 文件大小： | 2243K |
| 代理商： | PM7366 |
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RELEASED
DATA SHEET
PM7366 FREEDM-8
ISSUE 4
PMC-1970930
FRAME ENGINE AND DATA LINK MANAGER
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA,INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
181
The HDLC processor starts transmitting a packet when the channel FIFO free space is less
than or equal to the level specified in the appropriate Start Transmission Level column of the
following table or when an end of a packet is stored in the channel FIFO. When the channel
FIFO free space is less than or equal to the level specified in the Expedite Trigger Level
column of the following table and the HDLC processor is transmitting a packet and an end of
a packet is not stored in the channel FIFO, the partial packet buffer makes expedite requests
to the TMAC to retrieve XFER[2:0] + 1 blocks of data.
To prevent lockup, the channel transfer size (XFER[2:0]) can be configured to be less than or
equal to the start transmission level set by LEVEL[3:0] and TRANS. Alternatively, the channel
transfer size can be set, such that, the total number of blocks in the logical channel FIFO
minus the start transmission level is an integer multiple of the channel transfer size.
TRANS:
The indirect transmission start bit (TRANS), in concert with the LEVEL[3:0] bits, configure the
various channel FIFO free space levels which trigger the HDLC processor to start
transmission of a HDLC packet as well as trigger the partial packet buffer to make DMA
request for data as shown in the following table. The transmission start mode to be written to
the channel provision RAM, in an indirect write operation, must be set up in this register
before triggering the write. TRANS reflects the value written until the completion of a
subsequent indirect channel read operation.
The HDLC processor starts transmitting a packet when the channel FIFO free space is less
than or equal to the level specified in the appropriate Start Transmission Level column of the
following table or when an end of a packet is stored in the channel FIFO. When the channel
FIFO free space is greater than the level specified in the Expedite Trigger Level column of the
following table and the HDLC processor is transmitting a packet and an end of a packet is not
stored in the channel FIFO, the partial packet buffer makes expedited requests to the TMAC
to retrieve XFER[2:0] + 1 blocks of data.
To prevent lockup, the channel transfer size (XFER[2:0]) can be configured to be less than or
equal to the start transmission level set by LEVEL[3:0] and TRANS. Alternatively, the channel
transfer size can be set, such that, the total number of blocks in the logical channel FIFO
minus the start transmission level is an integer multiple of the channel transfer size.
Table 26 – Level[3:0]/TRANS Settings
LEVEL[3:0]
Expedite
Trigger Level
Start Transmission
Level (TRANS=0)
Start Transmission
Level (TRANS=1)
0000
2 Blocks
(32 bytes free)
1 Block
(16 bytes free)
1 Block
(16 bytes free)
0001
3 Blocks
(48 bytes free)
2 Blocks
(32 bytes free)
1 Block
(16 bytes free)
0010
4 Blocks
(64 bytes free)
3 Blocks
(48 bytes free)
2 Blocks
(32 bytes free)
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相關(guān)代理商/技術(shù)參數(shù) |
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| PM7366-BI | 制造商:PMC 制造商全稱:PMC 功能描述:FRAME ENGINE AND DATA LINK MANAGER |
| PM7366-PI | 制造商:PMC-Sierra 功能描述: |
| PM7367 | 制造商:PMC 制造商全稱:PMC 功能描述:FRAME ENGINE AND DATA LINK MANAGER |
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