AD6622SSLASHPCB datasheet(22/28 Pages) AD

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AD6622

–22–

REV. 0

External Address 7 Upper Address Register (Chan)

Sets the three most signiﬁcant bits of the internal address, effec-

tively selecting channels 1, 2, 3, or 4 (D2:D0). The autoincrement

of read and write are also set (D7:D6).

External Address 6 Lower Address Register (Addr)

Sets the internal address 8 LSBs (D7:D0).

External Address 5 Sync

This register is read only. Bits in this address control the synchroni-

zation of the AD6622 channels. If the user intends to bring up

channels with no synchronization requirements, then all bits of

this register should be written low. Two types of sync signals

are available with the AD6622. The ﬁrst is Soft Sync. Soft Sync

is software synchronization enabled through the Microport. The

second synchronization method is Pin Sync. Pin Sync is enabled

by a signal applied to the sync pin (Pin 62). See the Synchroni-

zation section of the data sheet for detailed explanations of the

different modes.

External Address 4 Reset

Bits in this register determine how the chip is programmed and

enables the channels. The program bits (D7:D4) must be set

high to allow programming of CMEM and DMEM for each

channel. Sleep bits (D3:D0) are used to activate or sleep channels.

These can be used manually by the user to bring up a channel

by simply writing the required channel high. These bits can also

be used in conjunction with the Start and Sync signals avail-

able in External Address 5 to synchronize the channels. See

the Synchronization section of the data sheet for detailed expla-

nation of different modes.

External Address 3:0 (Data Bytes)

These bits set the internal address to be accessed for a read or

write.

Table XII. External Memory Map

External

External Data

Address

7: Chan

Wrinc

Rdinc

IA10

IA9

IA8

6: Addr

IA7

IA6

IA5

IA4

IA3

IA2

IA1

IA0

5: Sync

Beam

Hop

Start

Sync D

Sync C

Sync B

Sync A

4: Reset

Prog D

Prog C

Prog B

Prog A

Sleep D

Sleep C

Sleep B

Sleep A

3: Byte3

ID31

ID30

ID29

ID28

ID27

ID26

ID25

ID24

2: Byte2

ID23

ID22

ID21

ID20

ID19

ID18

ID17

ID16

1: Byte1

ID15

ID14

ID13

ID12

ID11

ID10

ID9

ID8

0: Byte0

ID7

ID6

ID5

ID4

ID3

ID2

ID1

ID0

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