DS2196 datasheet(99/157 Pages) MAXIM

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DS2196

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Table 16-2: Error Insertion examples

Value

Write

Read

000h

do not create any

errors

no errors left to be

inserted

001h

create a single error

1 error left to be inserted

002h

create 2 errors

2 errors left to

inserted

3FFh

create 1023 errors

1023 errors left to be

inserted

NOEL1A: NUMBER of ERRORS LEFT 1 FRAMER A (Address = 83 Hex)

NOEL1B: NUMBER of ERRORS LEFT 1 FRAMER B (Address = 88 Hex)

NOEL2A: NUMBER of ERRORS LEFT 2 FRAMER A (Address = 84 Hex)

NOEL2B: NUMBER of ERRORS LEFT 2 FRAMER B (Address = 89 Hex)

(MSB)

(LSB)

NOEL1

––––––

NOEL2

SYMBOL

POSITION

NAME AND DESCRIPTION

NOEL2.1

MSB of the 10–bit Number of Errors Left Counter

NOEL1.0

LSB of the 10–bit Number of Errors Left Counter

Number Of Errors Left Registers. The Host can read the NOEL registers at any time (to determine

how many errors are left to be inserted) by toggling the RNOE bit in the Error Rate Control registers

(ERCA and ERCB) from a 0 to a 1. After the RNOE bit is toggled, the Host may read the NOEL

registers after waiting at least 972 ns (1.5 clock periods).

17.

HDLC CONTROLLER

The DS2196 has an enhanced HDLC controller configurable for use with the Facilities Data Link or

DS0s. There are 64 byte buffers in both the transmit and receive paths. The user can select any DS0 or

multiple DS0s as well as any specific bits within the DS0(s) to pass through the HDLC controller. See

Figure 21-7 for details on formatting the transmit side. Note that TBOC.6 = 1 and TDC1.7 = 1 cannot

exist without corrupting the data in the FDL. For use with the FDL, see section 18. See Table 17-1 for

configuring the transmit HDLC controller.

Table 17-1: TRANSMIT HDLC CONFIGURATION

Function

TBOC.6

TDC1.7

TCR1.2

DS0(s)

1 or 0

FDL

101

Disable

1 or 0

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