cx28250 Mindspeed Technologies, cx28250 Datasheet - Page 27

• Manufacturer Part Number: cx28250
• Description: Cx28250 Atm Physical Interface Phy Devices
• Manufacturer: Mindspeed Technologies

CX28250
ATM Physical Interface (PHY) Devices
Table 1-1. CX28250 Pin Definitions (5 of 12)
28250-DSH-002-C
MData[7]
MData[6]
MData[5]
MData[4]
MData[3]
MData[2]
MData[1]
MData[0]
MInt*
MRdy
TRST*
TCK
TMS
TDI
TDO
Pin Label
Microprocessor Data
Bus
Microprocessor
Interrupt
Microprocessor
Ready
Test Reset
Test Clock
Test Mode Select
Test Data Input
Test Data Output
Signal Name
Mindspeed Technologies
No.
M4
G3
H1
H2
K1
K3
K2
B1
H4
N4
P4
N5
J1
J4
L4
Type
TTL
TTL
TTL
TTL
TTL
TTL
TTL
TTL
TTL
TTL
TTL
TTL
TTL
TTL
TTL
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
O
O
O
I
I
I
I
These eight bits are a bidirectional data bus for
transferring the read and write data.
When a logic 0 is read on this pin, the device needs
servicing. It remains asserted until the pending
interrupt is acknowledged. This pin is an open drain
output for an external wired OR logic implementation.
When active high, the current read or write
transaction has been completed. For a read
transaction, the data is ready to be transferred to the
microprocessor. For a write transaction, the data
provided by the microprocessor has been written.
This pin is an open drain output for an external wired
OR logic implementation. An external pull-up resistor
is required for this pin.
When this pin is asserted, the internal boundary-scan
logic is reset. This pin has a pullup resistor.
Note: When JTAG is not used, this pin should be tied
either directly to ground or through a 1K or less pull
down resistor.
This pin samples the value of TMS and TDI on its
rising edge in order to control the boundary scan
operations.
This pin controls the boundary-scan Test Access Port
(TAP) controller operation. This pin has a pullup
resistor.
This pin is the serial test data input. This pin has an
internal pullup resistor.
This pin is the serial test data output.
™
1.4 CX28250 Pinout and Pin Descriptions
Description
1.0 Product Description
1-11