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17 PFC_DDD_v1.3.doc
Table 17. HDI6 Configuration
60x signal
HDI16 Signal
Description
Dh57
HDSP=0
Single data strobe mode
Dh58
HDDS=0
Negative data strobe polarity
Dh59 H8BIT=0
16-bit
mode
enabled
Dh60
HCS2=1
Not used, pulled high
Note that when using the host port the DSI interface must be configured for 32-bits
5.3
MSC8102 DSP Processing Array
The DSP farm contains 5 MSC8102 DSPs connected to the MSC8101 via a shared DSI 60x bus
interface. Each DSP has access to 16MB of SDRAM. The DSPs interface to the PSTN world through
the PTMC connector via their TDM links. In addition MSC8102 DSP1 (U19) has an SMC UART
connection to an onboard connector.
5.3.1
DSP Array SDRAM Configuration
Each DSP incorporates 128M-bit x32-bit wide x4 bank Micron MT48LC4M32B2 SDRAM surface
mounted onto the board providing 16 MBytes of general-purpose system RAM. The MSC8102’s Chip
Select 2 is used to select the SDRAM devices through the SDRAM controller, which is capable of
interfacing to JEDEC compatible SDRAM, the settings of which are now described.
•
SDRAM size is 1M x 32 x 4 Banks = 16MBytes, which requires 24 address lines.
•
Device has 8 column and 12 Row lines, 2 Bank Selects. The 32-bit port size means addresses
30 and 31 are not used.
For Page based interleaving the 60x bus is arranged as follows:
A[8:19]
A[20:21]
A[22:29]
A[30:31]
Row (x12)
Bank Select
Column (x8)
LSB
This gives the following MSC8101 Registers settings:
•
PSDMR[PBI] = 1, Page Based Interleaving
•
ORx[BPD] = 01, 4 Banks per device
•
ORx[ROWST] = 1000, Row Starts at A8
•
ORx[NUMR]= 011, SDRAM has 12 Row lines
From the SDRAM perspective during an ACTIVATE command it’s address port will look like:
A9:A19
A16:A17
A18:A29
A30:A31
--- Internal
Bank
Select
(A[20:21])
Row(A[8:19]) LSB
While a Read/Write will look like:
A9:A19
A16:A17
A[18:21]
A[22:29]
A30:A31
--- Internal
Bank
Select
(A[20:21])
Don’t
care
Column
(A[22:29])
LSB
This gives the following register settings:
•
PSDMR[SDAM] = 010, A[9:19] multiplexed to A[19:29]
•
PSMDR[BSMA] = 011, A[16-17] are used as Bank Selects Signals
•
PSMDR[SDA10] = 001, A9 maps to A10/AP pin
The full PSDMR settings are described in table