ZL50408GDC ZARLINK [Zarlink Semiconductor Inc], ZL50408GDC Datasheet - Page 20

• Manufacturer Part Number: ZL50408GDC
• Description: Managed 8-Port 10/100M 1-Port 10/100/1000M Ethernet Switch
• Manufacturer: ZARLINK [Zarlink Semiconductor Inc]

1.5
TSTOUT[15:0], M[7:0]_TXEN, M9_TXEN and M9_TXER pins serve as bootstrap pins during device power-up or
reset. Please refer to “Typical Reset & Bootstrap Timing Diagram” on page 118 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 ZL50408 allows the selection of 5 different management interfaces:
8/16-bit parallel, serial with MII, serial only and unmanaged serial with I2C
EEPROM.
TSTOUT[3:1] 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 ZL50408 supports module hotswap on all it's ports. This is enabled via
TSTOUT[9]. When enabled, bootstrap pins M[7:0]_TXEN (ports 0-7) and
M9-TXEN & M9_TXER (port 9) 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.
For the gigabit port, an optional feature to support half duplex is available. This
option should only be enabled if the PHY supports the half duplex functionality.
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 29)
TSTOUT[6:4] selects the device ID
Table 4 - Bootstrap Features
Zarlink Semiconductor Inc.
ZL50408
2
C EEPROM can be used to configure the device at
20
Description
Data Sheet