參數(shù)資料
型號(hào)： TSB41AB3IPFPEP
廠商： Texas Instruments
文件頁數(shù)： 28/55頁
文件大小： 0K
描述： IC 3PRT CABLE TXRX/ARBIT 80HTQFP
標(biāo)準(zhǔn)包裝： 96
類型： 收發(fā)器
驅(qū)動(dòng)器/接收器數(shù)： 6/6
規(guī)程： IEEE 1394
電源電壓： 3 V ~ 3.6 V
安裝類型： 表面貼裝
封裝/外殼： 80-TQFP 裸露焊盤
供應(yīng)商設(shè)備封裝： 80-HTQFP（12x12）
包裝： 托盤
產(chǎn)品目錄頁面： 882 (CN2011-ZH PDF)
其它名稱： 296-22528
V62/03612-01XE
TSB41AB3EP
IEEE 1394a2000 THREEPORT CABLE TRANSCEIVER/ARBITER
SGLS122C JULY 2002 REVISED JUNE 2008
34
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
LLC service request
To request access to the bus, to read or write a PHY register, or to control arbitration acceleration, the LLC sends
a serial bit stream on the LREQ terminal as shown in Figure 16.
Each cell represents one clock sample time, and n is the number of bits in the request stream.
LR1
LR2
LR3
LR (n-2)
LR0
LR (n-1)
Figure 17. LREQ Request Stream
The length of the stream varies depending on the type of request as shown in Table 12.
Table 12. Request Stream Bit Length
REQUEST TYPE
NUMBER OF BITS
Bus request
7 or 8
Read register request
9
Write register request
17
Acceleration control request
6
Regardless of the type of request, a start-bit of 1 is required at the beginning of the stream, and a stop-bit of
0 is required at the end of the stream. The second through fourth bits of the request stream indicate the type
of the request. In the descriptions below, bit 0 is the most significant and is transmitted first in the request bit
stream. The LREQ terminal is normally low.
Encoding for the request type is shown in Table 13.
Table 13. Request Type Encoding
LR1-LR3
NAME
DESCRIPTION
000
ImmReq
Immediate bus request. Upon detection of idle, the PHY takes control of the bus immediately without arbitration.
001
IsoReq
Isochronous bus request. Upon detection of idle, the PHY arbitrates for the bus without waiting for a subaction gap.
010
PriReq
Priority bus request. The PHY arbitrates for the bus after a subaction gap, ignores the fair protocol.
011
FairReq
Fair bus request. The PHY arbitrates for the bus after a subaction gap, follows the fair protocol.
100
RdReg
The PHY returns the specified register contents through a status transfer.
101
WrReg
Write to the specified register
110
AccelCtl
Enable or disable asynchronous arbitration acceleration
111
Reserved
For a bus request the length of the LREQ bit stream is 7 or 8 bits as shown in Table 14.
Table 14. Bus Request
BIT(s)
NAME
DESCRIPTION
0
Start bit
Indicates the beginning of the transfer (always 1).
1-3
Request type
Indicates the type of bus request. See Table 13.
4-6
Request speed
Indicates the speed at which the PHY sends the data for this request. See Table 15 for the encoding of this field.
7
Stop bit
Indicates the end of the transfer (always 0). If bit 6 is 0, this bit may be omitted.
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