zl50404 Zarlink Semiconductor, zl50404 Datasheet - Page 19

• Manufacturer Part Number: zl50404
• Description: Lightly Managed/unmanaged 5-port 10/100m Ethernet Switch
• Manufacturer: Zarlink Semiconductor

1.5
TSTOUT[15:0] and M[3:0]_TXEN pins serve as bootstrap pins during device power-up or reset. Please refer to
“Typical Reset & Bootstrap Timing Diagram” on page 111 for more information on when the bootstrap pins are
sampled. The bootstrap pins require external pull-up/down resistors for proper operation.
The table below summarizes the bootstrap options.
CPU Interface
Ethernet Interface
Misc. Features
Bootstrap Options
Feature
The ZL50404 allows the selection of 2 different management interfaces: serial
only and unmanaged serial with I2C EEPROM.
TSTOUT[3] is used to select the interface options mentioned above. If the
serial interface is selected, addition bootstrap options are required:
•
•
Also, an optional I
power-up or reset. TSTOUT[7] selects the EEPROM option.
The ZL50404 supports module hotswap on all it's ports. This is enabled via
TSTOUT[9]. When enabled, bootstrap pins M[3:0]_TXEN (ports 0-3) are used
to specify the module type to support multiple ethernet interfaces during
module hotswap.
Another feature is the MAC power savings mode. When enabled via
TSTOUT[11], each port's MAC will detect inactivity on the port and go into a
power savings state. Once activity is detected once again on the port, the MAC
will come out of this state.
One other feature selected via bootstrap is Timeout Reset Enable
(TSTOUT[12]). This enables a monitoring block with the device which will
detect if any hardware state machine is in a non-idle state for more than 5
seconds.
Refer to section 2.7 for more details on this feature.
TSTOUT[0] enables or disables the DEBOUNCE feature (refer to
“Synchronous Serial Interface” on page 26)
TSTOUT[6:4] selects the device ID
Table 3 - Bootstrap Features
Zarlink Semiconductor Inc.
ZL50404
2
C EEPROM can be used to configure the device at
19
Description
Data Sheet