Memory Types
The Neon
NEO-10-2
BitFlow, Inc.
Version G.5
10.2 Memory Types
10.2.1 Registers
All registers are 64 bits wide and on 64-bit boundary. With the exception of the DPM,
only data bits 31 to 0 are used, bits 63 to 32 are always “don't care”. The DPM uses all
64 bits. Out of the lower 32 LSBs, some registers use only a portion of the bits. Regis-
ters can also be accessed as 32 bit wide. Little endian addressing is used, i.e. MSB is
bits 63-56.
10.2.2 UART
The UART is 8 bit wide and its registers are on 64-bit boundary. The UART is only on
the Karbon-CL and Neon.
10.2.3 DPM
The DPM is 64 bit wide. The DPM can be accessed as 64-bit (on 64-bit boundary) or
as 32-bit wide (on 32-bit boundary) memory. During acquisition (GRAB/SNAP), the
slave read from DPM is inhibited. In this case, data read will be always zero.
Note: The DPM is only accessible form host on the R64.
10.2.4 CTABs
The CTabs for the Karbon-CL and Karbon-CXP, Alta and Neon are implemented
slightly differently than the R64. These CTabs are Run Length Encoded (RLE). The RLE
CTabs are stored in the same address space as is used for the CTabs on the R64, how-
ever, only the first 256 locations are actually populated. This reason this works is that
the RLE CTabs can compress the normal CTabs by a very large amount, considerably
reduce that memory requirements for CTabs.
Содержание NEO-PCE-CLB
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