Cypress Semiconductor CY7C68301C Manual de usuario descargar pdf (Pagina 16)

CY7C68300C, CY7C68301C

CY7C68320C, CY7C68321C

Document Number: 001-05809 Rev. *K Page 16 of 44

files, provides an easy way to enable and modify the HID

features of the AT2LP.

GPIO pins can be individually set as inputs or outputs, with byte

0x09 of the configuration data, enabling a mix of HID and general

purpose outputs. GPIOs that are not configured as inputs are

reported with a value of ‘0’ in the HID data. The RESERVED bits’

values must be ignored, and Cypress recommends using a

bitmask in software to filter out unused HID data.

Note that if using the 56-pin package, the reported GPIO[5:3]

values must be ignored because the pins are not actually

present.

Functional Overview

Chip functionally is described in the subsequent sections.

USB Signaling Speed

AT2LP operates at the following two rates defined in the USB 2.0

Specification dated April 27, 2000:

■ Full-speed, with a signaling bit rate of 12 Mbits/sec.

■ High-speed, with a signaling bit rate of 480 Mbits/sec.

AT2LP does not operate at the low-speed signaling rate of

1.5 Mbits/sec.

ATA Interface

The ATA/ATAPI port on the AT2LP is compatible with the

Information Technology–AT Attachment with Packet Interface–6

(ATA/ATAPI-6) Specification, T13/1410D Revision 2A. The

AT2LP supports both ATAPI packet commands and ATA

commands (by use of ATA Command Blocks), as outlined in

ATA Command Block (ATACB) on page 16. Refer to the USB

Mass Storage Class (MSC) Bulk-Only Transport (BOT)

Specification for information on Command Block formatting.

Additionally, the AT2LP translates ATAPI SFF-8070i commands

to ATA commands for seamless integration of ATA devices with

generic Mass Storage Class BOT drivers.

ATA Command Block (ATACB)

The ATA Command Block (ATACB) functionality provides a

means of passing ATA commands and ATA register accesses to

the attached device for execution. ATACB commands are

transferred in the Command Block Wrapper Command Block

(CBWCB) portion of the Command Block Wrapper (CBW). The

ATACB is distinguished from other command blocks by having

the first two bytes of the command block match the

bVSCBSignature and bVSCBSubCommand values that are

defined in Table 6. Only command blocks that have a valid

bVSCBSignature and bVSCBSubCommand are interpreted as

ATA Command Blocks. All other fields of the CBW and

restrictions on the CBWCB remain as defined in the USB Mass

Storage Class Bulk-Only Transport Specification. The ATACB

must be 16 bytes in length. The following table and text defines

the fields of the ATACB.

Table 5. HID Data Bitmap

USB Interrupt Data Byte 1 USB Interrupt Data Byte 0

7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0

RESERVED

USB High Speed

VBUS Powered

RESERVED

GPIO[5]

GPIO[4]

GPIO[3]

GPIO[2]

GPIO[1]

GPIO[0]

Table 6. ATACB Field Descriptions

Byte Field Name Field Description

0 bVSCBSignature This field indicates to the CY7C68300C/CY7C68301C that the ATACB contains

a vendor-specific command block. The value of this field must match the value

in EEPROM address 0x04 for the command to be recognized as a vendor-specific

ATACB command.

1 bVSCBSubCommand This field must be set to 0x24 for ATACB commands.

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 43 44

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