參數(shù)資料
型號(hào)： AD6652XBC
廠商： ANALOG DEVICES INC
元件分類(lèi)： 通信及網(wǎng)絡(luò)
英文描述： SPECIALTY TELECOM CIRCUIT, PBGA256
封裝： 17 X 17 MM, MINI, BGA-256
文件頁(yè)數(shù)： 68/76頁(yè)
文件大小： 1802K
代理商： AD6652XBC
AD6652
Preliminary Technical Data
Rev. PrC | Page 70 of 76
ollowing
s defined in the external memory
cess
The variable address is
Internal Read Access
t writing the channel address register
rite. The data registers (DR2–DR0)
0.
the
ta registers (DR2–DR1). This data can then be
d
addr
the a
data
Read
int
main
{
coef
defi
Exte
Inte
*/
// holding registers for the coefficient
int d2, d1, d0;
long
// w
writ
// write CAR
/* r
the internal registers to the interface registers
on t
d0 =
//
d2
coe
} /
Internal Write Access
Up to 20 bits of data (as needed) can be written by the f
process. Any high order bytes that are needed are written to the
corresponding data register
map 3-bit address space. The least significant byte is then
written to DR0 at Address (000). When a write to DR0 is
detected, the internal microprocessor port state machine then
moves the data in DR2–DR0 to the internal address pointed to
by the address in the channel address register (CAR) and ac
control register (ACR).
Write Pseudocode
void write_micro(ext_address, int data);
main();
{
/* This code shows the programming of the NCO
phase offset register using the write_micro
function as defined above.
the External Address A[2:0] and data is the value
to be placed in the external interface register.
Internal Address = 0x087
*/
// holding registers for NCO phase byte wide
access data
int d1, d0;
// NCO frequency word (16-bits wide)
NCO_PHASE = 0xCBEF;
// write ACR
write_micro(7, 0x03 );
// write CAR
write_micro(6, 0x87);
// write DR1 with D[15:8]
d1 = (NCO_PHASE & 0xFF00) >> 8;
write_micro(1, d1);
// write DR0 with D[7:0]
// On this write all data is transferred to the
internal address
d0 = NCO_FREQ & 0xFF;
write_micro(0, d0);
} // end of main
A read is performed by firs
(CAR) and ACR as with a w
are then read in the reverse order that they were written. First,
the least significant byte of the data (D[7:0]) is read from DR
On this transaction, the high bytes of the data are moved from
the internal address pointed to by the CAR and ACR into
remaining da
rea from the data registers using the appropriate 3-bit
esses. The number of data registers used depends solely on
mount of data to be read or written. Any unused bit in a
register should be masked out for a read.
Pseudocode
read_micro(ext_address);
();
/* This code shows the reading of the first RCF
ficient using the read_micro function as
ned above. The variable address is the
rnal Address A[2..0].
rnal Address = 0x000
// coefficient (20-bits wide)
coefficient;
rite ACR
e_micro(7, 0x00 );
write_micro(6, 0x00);
ead D[7:0] from DR0, All data is moved from
his access */
read_micro(0) & 0xFF;
// read D[15:8] from DR1
d1 = read_micro(1) & 0xFF;
read D[23:16] from DR2
= read_micro(2) & 0x0F;
fficient = d0 + (d1 << 8) + (d2 << 16);
/ end of main
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