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78P2351R Datasheet(PDF) 6 Page - Teridian Semiconductor Corporation |
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78P2351R Datasheet(HTML) 6 Page - Teridian Semiconductor Corporation |
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6 / 31 page  78P2351R Serial 155M NRZ to CMI Converter Page: 6 of 31 2006 Teridian Semiconductor Corporation Rev. 2.1 Pulse Amplitude Adjustment Contact TDK applications for information on user programmable registers with up to 200mV of programmable transmit gain. Transmit Backplane Equalizer An optional fixed LVPECL equalizer is integrated in the transmit path for architectures that use LIUs on active interface cards. The fixed equalizer can compensate for up to 1.5m of trace and can be enabled by the TXOUT1 pin or TXEQ bit as follows: TXOUT1 pin TXEQ bit Tx Equalizer Low 1 Enabled Float 0 Disabled POWER-DOWN FUNCTION Power-down control is provided to allow the 78P2351R to be shut off. Transmit and receive power-down can be set independently through SW control. Global power-down is achieved by powering down both the transmitter and receiver. Note: the 4-wire serial port interface and configuration registers are not affected by power- down. The transmitter can also be powered down using the TXPD control pin. The CMI outputs are tri-stated during transmit power-down for redundancy applications. The TXPD pin is active in both hardware and software modes. LOOPBACK MODES In SW mode, LLBK and RLBK bits in the Signal Control register are provided to activate the local and remote analog loopback modes respectively. In HW mode, the LPBK pin can be used to activate local and remote analog loopback paths as shown in the table below. LPBK pin Loopback Mode Low Normal operation Float Remote (analog) Loopback: Recovered receive clock and data looped back directly to the transmit driver. The CMI decoder and most of transmit path is bypassed (including the redundant Tx monitor output) High Local (analog) Loopback: Transmit clock and data looped back to receiver at the analog media interface. TD + TD - RD + RD - CMI ENDEC CDR Adaptive Eq. Fixed Eq. CDR Line-side Figure 3: Remote (analog) Loopback TD + TD - RD + RD - CMI ENDEC CDR Adaptive Eq. Fixed Eq. CDR Figure 4: Local (analog) Loopback In SW mode only, a Full Remote (digital) Loopback bit FLBK is also available in the Advanced Tx Control register. This loopback exercises the entire Rx and Tx paths of the 78P2351 including the Tx clock recovery unit. As such, the user must enable either Plesiochronous or Loop-timing transmit modes to utilize the Full Remote (digital) Loopback. TD + TD - RD + RD - CMI ENDEC CDR Adaptive Eq. Fixed Eq. CDR Line-side Figure 5: Remote (Digital) Loopback |
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