Cypress Semiconductor CYV15G0404DXB Guía de usuario descargar pdf (Pagina 22)

CYV15G0404DXB Evaluation Board

Users Guide

Page 22 of 56

Optical Transmission

For external loopback with an optical signal, connect an optical module into the optical connector (XT1A). See Figure 7-6. Also,

the control signals for Loop Enable, Use Local Clock and Input Select need to be configured (see Figure 7-7). Set LPENA = LOW

for external loopback mode, set ULCA

= HIGH for clock and data recovery, and set RCLKENA = LOW to disable the reclocker

function. Lastly, set INSELA = LOW to select the optical connector.

To run an external loopback BIST test, repeat the procedure in Section 7.1.1.3 on page 20, but replace the values for LPENA,

ULCA

, RCLKENA, and INSELA in Step 5 with the values listed in this section. The locations of the optical control and error signals

are shown in Figure 5-3 on page 13.

7.1.2 Four Channel BIST Set-up with Global Enable

7.1.2.1 Equipment Required

Equipment needed is the same as mentioned in Section 7.1.1.1 on page 19. This test will use the onboard clocks for each channel.

To reconnect the clocks, see Figure 6-4 on page 18.

7.1.2.2 Test Set-up

The purpose of this test is to display the device’s ability to operate each channel at a different frequency or in a different mode.

Also, this test will familiarize the user with the global configuration of the control latches. The Global Enable function can simul-

taneously configure multiple channels with the same settings. To show how to prevent a channel from participating in the global

configuration, Channel A will have the Global Enable function (GLENx) disabled. Follow the procedure below.

Figure 7-4. SMA Connectors for External Loopback Mode

Figure 7-5. Loop Enable, Use Local Clock, and Input

Select DIP Switches

Set INSELA = HIGH

(SMA Connectors)

Set ULCA = HIGH

(Clock & Data

Recovery)

(Ext. Loopback)

Set RCLKENA = LOW

(Reclocker Disabled)

Set LPENA = LOW

Figure 7-6. Optical Connector for External Loopback Mode

Figure 7-7. Loop Enable, Use Local Clock, and Input

Select DIP Switches

Set INSELA = LOW

(Optical Connectors)

Set ULCA = HIGH

(Clock & Data

Recovery)

(Ext. Loopback)

Set RCLKENA = LOW

(Reclocker Disabled)

Set LPENA = LOW

[+] Feedback

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 56 57

Comentarios a estos manuales

Sin comentarios

Cypress Semiconductor CYV15G0404DXB Guía de usuario Pagina 22

Comentarios a estos manuales

Relacionado con productos y manuales para Relojes De Pared Cypress Semiconductor CYV15G0404DXB