LP1072 datasheet(14/32 Pages) FREESCALE

14 / 32 page

LP1072 Advance Information, Rev. 0.3

Freescale Semiconductor

PRELIMINARY

LP1072 Interfaces

SDIO Host Mailbox Semaphore 2 Register (offset 0x001E)

1:0

Sdio_mbxp_2_sema

2 bit semaphore register to control whether the

host or the device has access to the shared

mailbox ram 2. The host should write a “01” to this

“01” the host should read this register. If the value

is “01” then the host owns access to the mailbox.

If the value read is “11” then the device owns

access to the mailbox. When the host is done

utilizing the mailbox then it should release

ownership of the mailbox by writing “00” to this

0’s

7:2

Reserved

⎯

992 byte Mailbox RAM 1 (offset 0x200F to 0x23FF)

7:0

Mbox_rdata_1[15:0]

Shared SDIO Mailbox. Both the ARM and Host

can use the mailbox for message exchange

between the SDIO device and the SDIO Host.

Prior to accessing the SDIO Mailbox the Host

should request and be granted the mailbox via the

mailbox semaphore 1 register described above.

Once the Host has been granted access to the

mailbox it may read/write the mailbox however it

likes. If the Host has not been granted access to

the mailbox it will not be able to read or write the

mailbox. Once the Host is finished with the

mailbox it should release control of the mailbox as

described in the mailbox semaphore 1 register.

⎯

1 Kbyte Mailbox RAM 2 (offset 0x2400 to 0x27FF)

7:0

Mbox_rdata_2[15:0]

Shared SDIO Mailbox. Both the ARM and Host

can use the mailbox for message exchange

between the SDIO device and the SDIO Host.

Prior to accessing the SDIO Mailbox the Host

should request and be granted the mailbox via the

mailbox semaphore 2 register described above.

Once the Host has been granted access to the

mailbox it may read/write the mailbox however it

likes. If the Host has not been granted access to

the mailbox it will not be able to read or write the

mailbox. Once the Host is finished with the

mailbox it should release control of the mailbox as

described in the mailbox semaphore 2 register.

⎯

Table 8. SDIO Function 1 Registers (continued)

Bit

Name

Description

ARM

Access

HOST

Access

Reset

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