M59330P Просмотр технического описания (PDF) - Renesas Electronics

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M59330P

LAN Transceiver

Renesas Electronics 

M59330P

(3) Communication functions

The M59330P normally outputs differential signals on BUS (+) (pin 7) and BUS (-) (pin 6), but when an anomaly is

detected, switches signal output to the RX pin (pin 4) according to the anomaly state.

When overcurrent is detected, an anomaly with the driver or transmission channel for which the overcurrent was

detected is assumed, and an error signal is output; at the same time, the signal for the other transmission channel is

output to the RX output (pin 4). As explained in (1) above, in some cases both drivers may be turned off; in such cases,

the RX output (pin 4) is fixed at "L".

When a logical anomaly is detected, an error signal (ERR (pin 3) = "L") is output, and at the same time the RX output

(pin 4) is driven to "L". After error signal output, a transmission channel for which a transmission signal edge is

detected is regarded as normal, and the signal for the channel is output to the RX output (pin 4).

Overcurrent detection takes precedence over logical anomaly detection in operations to switch the error signal output

and RX output.

Table 1. Anomaly modes and anomaly detection functions

Anomaly mode

Error output Communication after

anomaly detection

1 Bus(+)

GND short Y

Y

2

VDD short Y

Y

3

Open

Y

Y

4 Bus(–)

GND short Y

Y

5

VDD short Y

Y

6

Open

Y

Y

6 BUS(+), BUS(–) short

Y

N

Method of anomaly detection

(2)

(1), (2)

(2)

(1), (2)

(2)

(2)

(1)

Error Reset

After standby mode is entered (the STB pin (pin 2) ="L"), the M59330P error output is reset by inputting level "H" to

the ERR pin (pin 3). In this case, all operations relating to anomaly detection, such as overcurrent detection and RX

output switching, are canceled.

Standby Mode

By driving the STB pin (pin 2) to "L" level, the M59330P can be put into a low consumption current mode.

In standby mode, the driver and overcurrent detection functions do not operate, but the logical anomaly detection

function continues to operate, and except for overcurrent detection, detection of anomalies is possible. However, there

is only error signal output, and RX output signal switching is not performed.

In standby mode, the RX output is the logical sum of the BUS(+) signal and the BUS(-) signal.

Rev.1.0, Sep.16.2003, page 4 of 10

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