MT90225AG Zarlink Semiconductor, MT90225AG Datasheet - Page 39

• Manufacturer Part Number: MT90225AG
• Description: Description = 16 Port TC PHY For T1, E1 And DSL ;; Package Type = N/a ;; No. Of Pins =
• Manufacturer: Zarlink Semiconductor

Data Sheet
Figure 13 shows the connection of one ATM Device with more than one MT90225/226.
6.0 Support Blocks
6.1 Counter Block
The MT90225/226 includes 144 24-bit counters to provide statistical information on the device’s operation. All the
counters are cleared by a hardware reset. A maskable interrupt can be generated when the counter overflows.
Counters can also be latched to capture the state of all registers at once.
A predetermined value can also be loaded into a counter. This feature can be used to generate an interrupt after a
specified number of cells is processed. Counter values are incremented by 1 for every event occurrence and, when
the count reaches all 1’s, will overflow (to all 0’s).
6.1.1 UTOPIA Input I/F counters
There are four counters associated with the each of the 16 UTOPIA Inputs (from ATM layer to the MT90225/226)
for a total of 64 counters. These counters record the following information:
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the total number of cells or the total number of user cells received at the UTOPIA Input I/F
the total number of Idle Cells received at the UTOPIA Input I/F, removed or not
the total number of Unassigned Cells received at the UTOPIA Input I/F, removed or not
the number of cells having a single or multiple bit error in the HEC, removed or not but not including the
cells where the HEC is corrected
ATM
ATM Layer
Figure 13 - ATM Interface to Multiple MT90225/226
Zarlink Semiconductor Inc.
Txclk
TxEnb*
TxAddr
TxClav
TxData
TxSOC
Rxclk
RxEnb*
RxAddr
RxClav
RxData
RxSOC
Txclk
TxEnb*
TxAddr
TxClav
TxData
TxSOC
Rxclk
RxEnb*
RxAddr
RxClav
RxData
RxSOC
Physical Layer
MT90225/226
MT90225/226
Framer
Framer
Framer
Framer
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