
MT90520
Data Sheet
23
Zarlink Semiconductor Inc.
Ball Pin #
Pin Name
I/O
Type
Description
H2
UTO_IN_CLK
I/O
3.3 V CMOS
PD / 24 mA
Synchronization clock for data transfer on UTO_IN_DATA.
This clock can be output from an internal divider (equal to
MCLK/2) or input from an external source. (RxClk when
the MT90520 is in ATM mode; TxClk when the MT90520 is
in PHY mode.)
L4, J1, J2,
J3, K4
UTO_IN_ADD[4:0]
I
3.3 V CMOS
PD
Multi-PHY address signals. These address inputs are used
to poll the MT90520 and to select the next MPHY device to
receive data on UTO_IN_DATA. These signals are driven
from the ATM-end to the PHY-end, and only used when the
MT90520 is in PHY mode. (Inactive when the MT90520 is
in ATM mode; TxAddr when the MT90520 is in PHY
mode.)
H3, J4, G1,
G2, H4, G3,
F1, F2, H5,
G4, F3, E1,
E2, F4, D1,
E3
UTO_IN_DATA[15
:0]
I
3.3 V CMOS
PD
16-bit UTOPIA input bus for cell-based data. When in 8-bit
mode, only bits [7:0] are active. (RxData[15:0] when the
MT90520 is in ATM mode; TxData[15:0] when in PHY
mode.)
K5
UTO_IN_PAR
I
3.3 V CMOS
PD
Odd parity bit over UTO_IN_DATA[15:0]. When in 8-bit
mode, odd parity bit over UTO_IN_DATA[7:0]. (RxPrty
when the MT90520 is in ATM mode; TxPrty when in PHY
mode.)
K3
UTO_IN_SOC
I
3.3 V CMOS
PD
Start of Cell for UTO_IN_DATA. Active HIGH input signal
indicating the first word/byte of the cell being received.
(RxSOC when the MT90520 is in ATM mode; TxSOC when
in PHY mode.)
M4
UTO_IN_CLAVAT
M_ ENBPHY
I
3.3 V CMOS
PD
Handshake input for UTO_IN_DATA.
When the MT90520 is in ATM mode, this input is RxClav,
indicating that the PHY-end has a complete cell to transfer
on UTO_IN_DATA.
When the MT90520 is in PHY mode, this input is TxEnb*,
indicating that the ATM-end is transferring valid data on
UTO_IN_DATA.
H1
UTO_IN_ENBATM
_ CLAVPHY
O
3.3 V, 16 mA Handshake output for UTO_IN_DATA.
When the MT90520 is in ATM mode, this output is RxEnb*,
indicating that the MT90520 will begin to sample
UTO_IN_DATA and UTO_IN_SOC at the end of the next
clock cycle.
When the MT90520 is in PHY mode, this output is TxClav,
indicating that the MT90520 can accept a complete cell on
UTO_IN_DATA.
Table 4 - UTOPIA Bus Pins