參數(shù)資料
型號(hào)： DS2180AQN+T&R
廠商： Maxim Integrated Products
文件頁數(shù)： 33/35頁
文件大小： 0K
描述： IC TRANSCEIVER T1 44-PLCC
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 500
功能： 收發(fā)器
接口： T1
電路數(shù)： 1
電源電壓： 4.5 V ~ 5.5 V
電流 - 電源： 3mA
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 44-LCC（J 形引線）
供應(yīng)商設(shè)備封裝： 44-PLCC（16.59x16.59）
包裝： 帶卷 (TR)
包括： 警報(bào)生成和檢測(cè)，B7 填充模式，B8ZS 模式，錯(cuò)誤檢測(cè)和計(jì)數(shù)器，“硬件”模式，透明模式
DS2180A
7 of 35
ACB: ADDRESS COMMAND BYTE Figure 4
(MSB)
(LSB)
-
FRSR2
EYELMD
FM
SYELMD
B8ZS
B7
LPBK
SYMBOL
POSITION
NAME AND DESCRIPTION
-
CCR.7
Reserved, must be 0 for proper operation.
FRSR2
CCR.6
Function of REC Status Register 2.
0 = Detected B8ZS code words reported at RSR.2.
1 = COFA (Change-of-Frame Alignment) reported at RSR.2 when
last resync resulted in change of frame or multiframe alignment.
EYELMD
CCR.5
193E Yellow Mode Select.
0 = Yellow alarm is a repeating pattern set of 00 hex and FF hex.
1 = Yellow alarm is a 0 in the bit 2 position of all channels.
FM
CCR.4
Frame Mode Select.
0 = D4 (193S, 12 frames/superframe).
1 = Extended (193E, 24 frames/superframe).
SYELMD
CCR.3
193S Yellow Mode Select. Determines yellow alarm type to be
transmitted and detected while in 193S framing. If set, yellow
alarms are a 1 in the S-bit position of frame 12; if cleared, yellow
alarm is a 0 in bit 2 of all channels. Does not affect 193E yellow
alarm operation.
B8ZS
CCR.2
Bipolar eight zero substitution.
0 = No B8ZS.
1 = B8ZS enabled.
(Note: This bit must be set to 0 when CCR.1=1)
B7
CCR.1
Bit seven zero suppression. If CCR.1=1, channels with an all zero
content will be transmitted with bit 7 forced to 1. If CCR.1=0, no
bit 7 stuffing occurs.
(Note: This bit must be set to 0 when CCR.2=1)
LPBK
CCR.0
Loopback. When set, the device internally loops output transmit
data into the incoming receive data buffers and TCLK is internally
substituted for RCLK.
LOOPBACK (Refer to Figure 4)
Enabling loopback will typically induce an out-of-frame (OOF) condition. If appropriate bits are set in
the receive control register, the receiver will resync to the looped transmit frame alignment. During the
looped condition, the transmit outputs (TPOS, TNEG) will transmit unframed all 1's. All operating modes
(B8ZS, alarm, signaling, etc.) except for blue alarm transmission are available in loopback.
BIT SEVEN STUFFING
Existing systems meet 1's density requirements by forcing bit 7 of all zero channels to 1. Bit 7 stuffing is
globally enabled by asserting bit CCR.1 and may be disabled on an individual channel basis by setting
appropriate bits in TTR1–TTR3. Bit 7 stuffing and B8ZS modes should not be enabled simultaneously.
Enabling both results in LOS.
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