Philips TDA5360 - Manual (Page 17)

1998 July 30
Philips Semiconductors Objective Specification, Revision 2.2
Pre-Amplifier for Hard Disk Drive with
MR-Read / Inductive Write Heads
TDA5360
17
10.6 Registers description
Nb Register Name Contents
0 Head Select Register HS3..HS0 = 0,0,0,0 to 1,0,1,1 = H0 to H11
SELT : if HIGH, the multiple selection detector is enabled. Inactive in STW mode
SELF : is set HIGH if illegal MDS is detected (read back only bit)
( Note 0 )
LCS1,LCS0 : copy of CS1,CS0 pins state (read back only bits)
1 Control Register PORI : Select a MR Bias mode.
LOW = Current Bias
HIGH = Power Bias
GMR : select the range to be used in current or power
LOW = SAL range
HIGH = GMR range
RIN1,0 = define the input impedance of the reader.
(0,0)
= 30 Ω
(0,1) = 23
Ω
(1,0) = 18 Ω
(1,1) = 15
Ω
RVORI = Reader output buffer mode.
LOW
= Voltage mode
HIGH = Current mode
WVORI = Writer data inputs mode.
LOW
= Voltage mode,
HIGH = Current mode
( Note 1a)
BFCTL = Control of BFAST pin functionality
( Note 1b)
2 Reader Bias Register DUMMY : Dummy head is selected in read mode if LOW
PWR4...PWR0 = define Imr current/power.
Range according to GMR bit setting
Rmr current bias mode :
SAL : Imr = 4mA+200uA*(pwr0 + 2 * pwr1 + 4 * pwr2 + 8 * pwr3 + 16 * pwr4)
GMR : Imr = 3mA+100uA*(pwr0 + 2 * pwr1 + 4 * pwr2 + 8 * pwr3 + 16 * pwr4)
Rmr power bias mode :
SAL : Pwr = 1.5mW+250uW*(pwr0 + 2 * pwr1 + 4 * pwr2 + 8 * pwr3 + 16 * pwr4)
GMR : Pwr = 375uW+62.5uW*(pwr0 + 2 * pwr1 + 4 * pwr2 + 8 * pwr3 + 16 * pwr4)
GAIN1, GAIN0 = read amplifier gain.
(0,0)
= 44 dB
(0,1) = 47 dB
(1,0) = 50 dB
(1,1) = Differentiator only