AK4368 Datasheet, PDF (45/58 Pages) Asahi Kasei Microsystems – PLL & HP-AMP DAC

ASAHI KASEI
[AK4368]
(2)-2. READ໋ྩ
R/WϏοτ͕ “1”ͷ৔߹ɺAK4368͸READಈ࡞Λߦ͍·͢ɻࢦఆ͞ΕͨΞυϨεͷσʔλ͕ग़ྗ͞Εͨޙɺ
Ϛελ͕ఀࢭ৚݅ΛૹΒͣ֬ೝԠ౴Λੜ੒͢ΔͱɺαϒΞυϨε͕ࣗಈతʹΠϯΫϦϝϯτ͞Εɺ࣍ͷΞυ
ϨεͷσʔλΛಡΈग़͢͜ͱ͕Ͱ͖·͢ɻΞυϨε “0CH”ͷσʔλΛಡΈग़ͨ͠ޙɺ͞Βʹ࣍ͷΞυϨεΛ
ಡΈग़͢৔߹ʹ͸ΞυϨε “00H”ͷσʔλ͕ಡΈग़͞Ε·͢ɻ
AK4368͸ΧϨϯτΞυϨεϦʔυͱϥϯμϜϦʔυͷ2ͭͷREAD໋ྩΛ͍࣋ͬͯ·͢ɻ
(2)-2-1. ΧϨϯτΞυϨεϦʔυ
AK4368͸಺෦ʹΞυϨεΧ΢ϯλΛ͓࣋ͬͯΓɺΧϨϯτΞυϨεϦʔυͰ͸͜ͷΧ΢ϯλͰࢦఆ͞ΕͨΞ
υϨεͷσʔλΛಡΈग़͠·͢ɻ಺෦ͷΞυϨεΧ΢ϯλ͸࠷ʹޙΞΫηεͨ͠ΞυϨεͷ࣍ͷΞυϨε஋
Λอ͍࣋ͯ͠·͢ɻྫ͑͹ɺ࠷ʹޙΞΫηε(READͰ΋WRITEͰ΋)ͨ͠ΞυϨε͕ “n”Ͱ͋ΓɺͦͷޙΧϨ
ϯτΞυϨεϦʔυΛߦͬͨ৔߹ɺΞυϨε “n+1”ͷσʔλ͕ಡΈग़͞Ε·͢ɻΧϨϯτΞυϨεϦʔυͰ
͸ɺAK4368͸READ໋ྩͷεϨʔϒΞυϨε(R/W = “1”)ͷೖྗʹରͯ֬͠ೝԠ౴Λੜ੒͠ɺ࣍ͷΫϩοΫ͔
Β಺෦ͷΞυϨεΧ΢ϯλͰࢦఆ͞ΕͨσʔλΛग़ྗͨ͠ͷͪ಺෦Χ΢ϯλΛ1ͭΠϯΫϦϝϯτ͠·͢Ňσ
ʔλ͕ग़ྗ͞ΕͨޙŊϚελ͕֬ೝԠ౴Λੜ੒ͤͣఀࢭ৚݅ΛૹΔͱɺREADಈ࡞͸ऴྃ͠·͢ɻ
S
T
S
A
R/W= “1”
T
R
O
T
P
SDA
S
Slave
Address
Data(n)
Data(n+1) Data(n+2)
Data(n+x) P
A
A
A
A
A
A
C
C
C
C
C
C
K
K
K
K
K
K
Figure 40. CURRENT ADDRESS READ ໋ྩ
(2)-3-2. ϥϯμϜΞυϨεϦʔυ
ϥϯμϜΞυϨεϦʔυʹΑΓ೚ҙͷΞυϨεͷσʔλΛಡΈग़͢͜ͱ͕Ͱ͖·͢ɻϥϯμϜΞυϨεϦʔ
υ͸READ໋ྩͷεϨʔϒΞυϨε(R/W bit= “1”)Λೖྗ͢ΔલʹɺμϛʔͷWRITE໋ྩΛೖྗ͢Δඞཁ͕͋
Γ·͢ɻϥϯμϜΞυϨεϦʔυͰ͸࠷ॳʹ։࢝৚݅Λೖྗ͠ɺ࣍ʹWRITE໋ྩͷεϨʔϒΞυϨε(R/W =
“0”)ɺಡΈग़͢ΞυϨεΛॱ࣍ೖྗ͠·͢ɻAK4368͕͜ͷΞυϨεೖྗʹରͯ֬͠ೝԠ౴Λੜ੒ͨ͠ޙɺ࠶
ૹ৚݅ɺREAD໋ྩͷεϨʔϒΞυϨε(R/W bit= “1”)Λೖྗ͠·͢ɻAK4368͸͜ͷεϨʔϒΞυϨεͷೖྗ
ʹରͯ֬͠ೝԠ౴Λੜ੒͠ɺࢦఆ͞ΕͨΞυϨεͷσʔλΛग़ྗ͠ɺ಺෦ΞυϨεΧ΢ϯλΛ1ͭΠϯΫϦϝ
ϯτ͠·͢ɻσʔλ͕ग़ྗ͞ΕͨޙɺϚελ͕ΞΫϊϦοδΛੜ੒ͤͣఀࢭ৚݅ΛૹΔͱɺREADಈ࡞͸ऴ
ྃ͠·͢ɻ
S
S
T
T
S
A
R/W= “0”
A
R/W= “1”
T
R
R
O
T
T
P
SDA
S
Slave
Address
Sub
Address(n)
S
Slave
Address
Data(n)
Data(n+1)
Data(n+x) P
A
A
C
C
K
K
A
A
A
A
A
C
C
C
C
C
K
K
K
K
K
Figure 41. RANDOM ADDRESS READ ໋ྩ
MS0409-J-01
- 45 -
2005/08