Best Data CMX300 Specifications download pdf (Page 27)

Functional Description

30-Dec-2010 CM-X300 Reference Guide Rev 1.31 27

LB-BE[1:0]#

Data byte enable.

nBE0 corresponds to DF-IO[7:0]

nBE1 corresponds to DF-IO[15:8]

0 = Do not mask out corresponding byte

1 = Mask out corresponding byte

LB-RDY

Variable-Latency I/O Ready signal for inserting wait states.

0 = Wait

1 = VLIO is ready

Table 19 Local Bus Signals (NFC)

CM-X300 Signal

Name

Type

Description

DF-IO[15:0]

I/O

Bidirectional data/address bus

DF-CS[1:0]#

Chip selects

DF_CLE_nOE

Command latch enable

DF_ALE_nWE

Address latch enable

DF-RE#

Read enable

DF-WE#

Write enable

DF-RB#

Ready/Busy_n (Low when Busy)

3.3.6.2 Static Memory Controller Address Map

The SMC has four separate partitions that are shown in Table 20.

Note: LB-CS0 is used internally as a chip select for the onboard Ethernet controller and

cannot be used externally on modules with ―E‖ option.

Table 20 SMC Address Map

Chip Select

Address Range

LB-CS0

0x0000_0000–0x0FFF_FFFF (256 Mbyte)

LB-CS1

0x3000_0000–0x3FFF_FFFF (256 Mbyte)

LB-CS2

0x1000_0000–0x13FF_FFFF (64 Mbyte)

LB-CS3

0x1400_0000–0x17FF_FFFF (64 Mbyte)

3.3.6.3 Local Bus Operation

For information about local bus AC characteristics refer to the Marvell PXA3xx (88AP3xx)

Processor Family EMPI document, section 7.2.

For information related to operation of the Data Flash Interface representing the local bus in

the CM-X300, refer to the Marvell® PXA3xx (88AP3xx) Processor Family Developers

Manual Vol. II: Memory Controller Configuration Developers Manual, sections 2 and 3.

3.3.7 Keypad

The CM-X300‘s keypad controller manages up to 8x6 matrix keys, up to eight direct keys,

and up to two rotary encoders, which can implement scroll keys, jog-dials, and

thumbwheels. The keypad controller provides an interface to two styles of keypads

simultaneously through the matrix and direct keypad interface. The controller manages both

manual and automatic scans.

Stable keypad activity that lasts longer than the debounce interval generates an interrupt. A

manual matrix scan can then be conducted to assert the scan lines sequentially. The row

readings for each column are read as they are scanned. If the ―ignore-multiple-keypress‖

policy is chosen, only one interrupt is generated for a debounced keypress. For example, if

three keys are pressed and held, only one interrupt is generated after the first key is pressed

and held. The column-scan signals are automatically asserted in sequence by the automatic

scan logic in the keypad controller, and the row readings are stored in the automatic scan

registers. Automatic scans can be initiated by either of the following methods:

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Best Data CMX300 Specifications Page 27

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