DS26503LN+【PDF 42/122 页】IC T1/E1/J1 BITS ELEMENT 64-LQFP

收藏本站

您好，
买卖IC网欢迎您。
请登录
免费注册

买卖IC网

Sheet目录1994

38页 39页 40页 41页 [42页]43页 44页 45页 46页

DS26503 T1/E1/J1 BITS Element

26 of 122

6. HARDWARE CONTROLLER INTERFACE

In Hardware Controller mode, the parallel and serial port pins are reconfigured to provide direct access to

certain functions in the port. Only a subset of the device’s functionality is available in hardware mode.

Each register description throughout the data sheet indicates the functions that may be controlled in

hardware mode and several alarm indicators that are available in both hardware and processor mode.

Also indicated are the fixed states of the functions not controllable in hardware mode.

6.1 Transmit Clock Source

Refer to Figure 3-3. In Hardware Controller mode, the input to the TX PLL is always TCLK PIN. TX

CLOCK is selected by the TCSS0 and TCSS1 pins, as shown in Table 6-1. The PLL_OUT pin is always

the same signal as select for TX CLOCK. If the user wants to slave the transmitter to the recovered

clock, then the RCLK pin must be tied to the TCLK pin externally.

Table 6-1. Transmit Clock Source

TCSS1

PIN 31

TCSS0

PIN 63

TRANSMIT CLOCK SOURCE

The TCLK pin is the source of transmit clock.

The PLL_CLK is the source of transmit clock.

The scaled signal present at MCLK as the transmit

clock.

The signal present at RCLK is the transmit clock.

6.2 Internal Termination

In Hardware Controller mode, the internal termination is automatically set according to the receive or

transmit mode selected. It can be disabled via the TITD and RITD pins. If internal termination is enabled

in E1 mode, the E1TS pin is use to select 75

or 120 termination. The E1TS pin applies to both

transmit and receive.

Table 6-2. Internal Termination

PIN NAME

FUNCTION

TITD

PIN 5

Transmit Internal Termination Disable. Disables the internal transmit

termination. The internal transmit termination value is dependent on the state of

the TMODEx pins.

RITD

PIN 6

Receive Internal Termination Disable. Disables the internal receive

termination. The internal receive termination value is dependent on the state of

the RMODEx pins.

E1TS

PIN 9

E1 Termination Select. Selects 120

or 75 internal termination when one of

the E1 modes is selected and internal termination is enabled. IF E1 is selected for

both transmit and receive, then both terminations will be the same.

0 = 75

1 = 120

发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

*型号	*数量	厂商	批号	封装

添加更多采购

采购需求

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

我的联系方式