參數(shù)資料
型號： MC145574
廠商： Motorola, Inc.
英文描述： ISDN S/T-Interface Transceiver
中文描述： 綜合業(yè)務(wù)數(shù)字網(wǎng)S / T的接口收發(fā)器
文件頁數(shù)： 99/164頁
文件大?。?/td> 1072K
代理商： MC145574
MC145574
11–1
MOTOROLA
The S/T–interface is designed for full–duplex transmission of two 64 kbps B channels and one 16 kbps
D channel between one NT device and one or more TEs. The TEs gain access to the B channels
by sending layer 2 frames to the network over the D channel. CCITT I.430, ETSI ETS 300012, and
ANSI T1.605 specify a D channel access algorithm for TEs to gain access to the D channel. The
MC145574 S/T transceiver is fully compliant with the D channel access algorithm as defined in CCITT
I.430, ETSI ETS 300012, and ANSI T1.605. The D channel operation is handled through the SCP
when using the S/T–interface either in IDL2 or GCI indirect mode, and handled through the C/I channel
when using the S/T–interface GCI direct mode.
The various bits and pins directly pertaining to D channel operation are shown in Tables 11–1 and
11–2.
Table 11–1. Channel SCP Bit Description
NT Mode
TE Mode
SCP Bit
Description
SCP Bit
Description
NR2(0)
NT Terminal Class
NR2(0)
Class
NR3(0)
Interrupt on D Channel
Collision in NT Terminal Mode
NR3(1)
Interrupt on D Channel Collision
NR4(0)
Interrupt Enable for NR3(0)
NR4(1)
Interrupt Enable for NR3(1)
BR7(4)
Invert the Echo Channel
BR7(1)
LAPD Polarity Control
BR13(2)
Force the Echo Channel to 0
BR4(4)
Map Echo Bits to D Timeslots on IDL2 Tx
BR13(7)
NT1 Star Mode Enable
BR7(6)
D Channel Procedures Ignored
OR8(1)
NT Terminal Mode Enable
Table 11–2. D Channel Operation
Pin Description
Pin
IDL2 Mode
GCI Mode
TQFP Pin 5
SOIC Pin 8
DGRANT/ANDOUT
GCI_SG/ANDOUT
TQFP Pin 6
SOIC Pin 9
DREQUEST/ANDIN
Tie Low/DREQUEST/ANDIN
TQFP Pin 7
SOIC Pin 10
CLASS/ECHO IN
Tie Low/CLASS/ECHO IN
D channel data is clocked into the MC145574 via Din on the falling edges of DCL. Data is clocked
out onto Dout on the rising edges of DCL. For a detailed description of the above pins, refer to Sec-
tion 7. For a detailed description of the above SCP bits, refer to Sections 8 and 9.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
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