S8401/S8501 HD-SDI收发器：高性能视频接口解决方案

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"S8401/S8501是专为HD-SDI（高清晰度串行数字接口）设计的一对收发芯片，符合SMPTE292M标准，适用于高清视频设备间的传输，如压缩器、视频图形、视频编辑器等。该芯片集成了微功耗双极型技术，具有低功耗和高稳定性。" HD-SDI收发器是用于高清视频传输的重要组件，它们确保了在光纤或同轴电缆上传输高清视频信号的高质量和稳定性。S8401/S8501芯片是这种收发器的一个例子，它们专为满足SMPTE292M标准而设计，这是一个定义了高清串行数字接口的技术规范，通常用于专业视频设备，如广播、电影制作和后期制作领域。 S8401是一个HD-SDI串行器发射器，它包含一个锁相环(PLL)，可以从低速参考时钟合成1.485Gb/s或1.485/1.001Gb/s的高速信号，这是HD-SDI传输所需的数据速率。PLL的作用是保持数据传输的精确同步，确保视频信号的无损传输。另一方面，S8501是HD-SDI解串器接收器，同样内置PLL，用于时钟恢复和数据恢复，即使在长距离传输后也能保证信号的完整性。这两款芯片都提供了20位并行TTL兼容接口，便于与各种数字视频设备连接。它们的串行接口是低抖动PECL兼容，确保了信号的干净和准确。另外，S8401/S8501还具备锁检测功能，可以监测传输是否正常；本地回环功能允许用户进行本地测试，确保设备内部信号处理的正确性；而接收器持续下游时钟输出则进一步增强了系统的同步能力。这些特性使得S8401/S8501芯片非常适合各种应用，包括但不限于视频压缩器、视频图形处理器、视频编辑系统、磁盘存储设备、录像机（VTR）、摄像机、监视器、帧同步器以及字符发生器等。由于只需要单个+3.3V电源供电，并且封装在紧凑的52引脚PQFP封装中，它们也易于集成到各种硬件设计中。 HD-SDI收发器是高清视频传输的核心，而S8401/S8501芯片凭借其高效能和灵活性，成为了高清视频设备制造商的首选解决方案，它们确保了高清视频信号在不同设备间可靠、高质量的传输。

HIGH DEFINITION SERIAL DIGITAL INTERFACE (HD-SDI) CHIPSET

S8401/S8501

December 10, 1999 / Revision C

S8501 RECEIVER

Architecture/Functional Description

The S8501 receiver is designed to implement SMPTE

292M Specification receiver functions. A block dia-

gram showing the basic chip function is provided in

Figure 4.

Whenever a signal is present, the S8501 attempts to

achieve bit synchronization of the received encoded

bit stream. Received data from the incoming bit stream

is provided on the device’s parallel data outputs.

The S8501 accepts serial encoded data from a fiber

optic or coaxial cable interface. The serial input stream

is the result of the serialization of scrambled data by

a compatible transmitter. Clock recovery is performed

on-chip, with the output data presented to the trans-

mission layer as 20-bit parallel data. The chip operates

at the HD-SDI frequency of 1.485Gb/s.

Serial/Parallel Conversion

Serial data is received on the RX, RY pins. The PLL

clock recovery circuit will lock to the data stream if the

clock to be recovered is within ±100 PPM of the inter-

nally generated bit rate clock. The recovered clock is

used to retime the input data stream. The data is then

clocked into the serial to parallel output registers.

Reference Clock Input

The reference clock input must be supplied with a

PECL single-ended AC coupled crystal clock source

at ±100 PPM tolerance. See Table 2 for reference

clock frequency.

Framing

Framing is performed off-chip. Typically, an FPGA

would be used to implement descrambling and Word/

Frame synchronization as required by SMPTE 292M.

Lock Detect

The S8501 lock detect function indicates the state of

the phase-locked loop (PLL) clock recovery unit. The

PLL will indicate lock within 2.5µs after the start of

receiving serial data inputs. If the serial data inputs

have an instantaneous phase jump (from a serial

switch, for example) the PLL will not indicate an out-

of-lock state, but will recover the correct phase

alignment within 250 bit times. If a run length of 80-

160 bits is exceeded the loop will declare loss of lock.

Input data rate variation (compared to REFCLK) can

also cause loss of lock. Table 3 shows the response

of the PLL loop circuit to input data rate variation.

When lock is lost, the PLL will attempt to re-acquire

bit synchronization, and will shift from the serial input

data to the reference clock so that the correct fre-

quency downstream clocking will be maintained.

The LOCKDETN output will go inactive (High) when

no data is present on the serial data inputs. When

LOCKDETN is in the inactive (high) state, it indicates

that the PLL is locking to the local reference clock to

maintain downstream clocking. When LOCKDETN is

in the active (low) state, it indicates that the PLL is

attempting to lock to the incoming serial data. When

serial data is restored, the LOCKDETN output will

stay in the active state.

REFCLK

(Input)

RCLK

(Output)

PARALLEL

DATA BUS

(Input)

D1D0

D9 D10 D11 D12

D13

D14

D15

PARALLEL

DATA BUS

(Output)

SERIAL DATA

D0/D1 D2/D3 D4/D5 D6/D7 D8/D9 D10/D11 D12/D13 D14/D15

Figure 5. Functional Waveform

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