STC5425 Datasheet, PDF (22/48 Pages) Connor-Winfield Corporation – Line Card Clock

The STC5425 has a pin EVENT_ INTR (pin 8) for
indicating the event interrupt occurrence. The pin
may be wired to user’s micro-controller. User can pro-
gram the Interrupt Mask register to decide which of
interrupt events will send an alarm to the micro-con-
troller by asserting the EVENT_INTR pin. User can
program at the Interrupt Configuration register to
specify the logic level (active high or low) of the pin
EVENT_INTR when it’s trigged by the interrupt event.
User may also program the Interrupt Configuration
register to define pin states as tri-state or logic inac-
tive when no interrupt event occurs.
Field Upgradability
The STC5425 supports field upgradability which
allows the user to load size of 7600 byte firmware
configuration data (provided as per request) via bus
interface. Field upgrade can only be performed at
least 3ms after reset.
1. User may read Bit READY of the register Field
Upgrade Status to check if field upgrade is ready to
start.
2. To begin the field upgrade, write to register Field
Upgrade Start three times consecutively, with no
intervening read/writes from/to other registers, see
the register Field Upgrade Start for details.
3. Once the field upgrade process begins, the
STC5425 is hold for data loading. Write 7600 bytes
firmware configuration data to the register Field
Upgrade Data one byte at a time to complete data
loading. User can read the same register for the writ-
ten byte. But no matter how many times the user
read, only the last written byte will be read from the
register.
4. Read the register Field Upgrade Count for how
many bytes of configuration data has been loaded. Bit
Load_Compelet of the register Field Upgrade Status
will indicate whether the 7600 bytes loading is com-
plete and meanwhile bit CHECKSUM will indicate the
loading is failed or succeed. See register description
of Field Upgrade Status for details.
STC5425
Line Card Clock
Data sheet
Functional Specification
Preliminary
Page 22 of 48 TM113 Rev: P1.3
Date: September 20, 2011
© Copyright the Connor-Winfield Corp. All Rights Reserved Specifications subject to change without notice