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CX28331 Datasheet(PDF) 28 Page - Synaptics Incorporated. |
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CX28331 Datasheet(HTML) 28 Page - Synaptics Incorporated. |
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28 / 68 page  1.0 Pin Description CX28331/CX28332/CX28333 1.1 Pin Assignments Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit 1-18 Conexant 100985A 71 —— LLOOP Local loopback enable Ch1 I Local loopback enable per channel. The transmit data is looped back immediately from the encoder to the decoder in place of the received data. 1 = local loopback enabled 0 = local loopback disabled — 93 93 LLOOP1 — 32 71 LLOOP2 Local loopback enable Ch2 I —— 32 LLOOP3 Local loopback enable Ch3 I 72 —— RLOOP Remote loopback enable Ch1 I Remote loopback enable per channel. The receive data, retimed after clock recovery, is looped back into the AMI generator in place of the transmit data. 1 = remote loopback enabled 0 = remote loopback disabled — 94 94 RLOOP1 — 31 72 RLOOP2 Remote loopback enable Ch2 I —— 31 RLOOP3 Remote loopback enable Ch3 I 56 —— XOE Transmit output enable Ch1 I Transmit output enable per channel. 1 = transmit line output driver enabled 0 = transmit output driver set to high impedance state — 90 90 XOE1 — 35 56 XOE2 Transmit output enable Ch2 I —— 35 XOE3 Transmit output enable Ch3 I 57 —— REQH Ch1 Receive High EQ Gain Enable I The equalizer in the CX2833i has two gain settings. The higher gain setting is designed to optimally equalize a nominally-shaped (meets the pulse template), pulse-driven DS3 or STS-1 waveform that is driven through 0–900 feet of cable. Square-shaped pulses such as E3 or DS3-HIGH require less high-frequency gain and should use the low EQ gain setting. REQH = 1 high EQ gain (DS3/STS-1 modes) REQH = 0 low EQ gain (E3/DS3 Square Modes) — 89 89 REQH1 — 36 57 REQH2 Ch2 Receive High EQ Gain Enable I —— 36 REQH3 Ch3 Receive High EQ Gain Enable I Power/Ground 15 —— TVDD TX power Ch1 P Power pins for transmit circuitry per channel (3.3 V). 55 TVDD1 — 25 15 TVDD2 TX power Ch2 P —— 25 TVDD3 TX power Ch3 P Table 1-2. CX2833i-3x Pin Definitions (5 of 8) Pin # Signal Name Description I/O/P Notes CX28331-3x CX28332-3x CX28333-3x |
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