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author cam900 <dbtlrchl@naver.com>2020-10-06 23:07:42 +0900
committer GitHub <noreply@github.com>2020-10-06 17:07:42 +0300
commit0cf5ca4ebaedbaa1a0dda513433c2e7fc5624408 (patch)
tree3166e870ee3a7aec96181737447016b48d518148
parenta25dbaad04c89b39e3cd43afe59ecc0611e4d0e9 (diff)
prot_fatfury2.cpp: Fix bitswap, Add notes (#7331)
* prot_fatfury2.cpp: Fix bitswap, Add notes * prot_fatfury2: typo * prot_fatfury2.cpp: Fix copy-paste issue
-rw-r--r--src/devices/bus/neogeo/prot_fatfury2.cpp16
1 files changed, 13 insertions, 3 deletions
diff --git a/src/devices/bus/neogeo/prot_fatfury2.cpp b/src/devices/bus/neogeo/prot_fatfury2.cpp
index c8e7151e6e8..b88d7b43ec1 100644
--- a/src/devices/bus/neogeo/prot_fatfury2.cpp
+++ b/src/devices/bus/neogeo/prot_fatfury2.cpp
@@ -41,7 +41,12 @@ uint16_t fatfury2_prot_device::protection_r(offs_t offset)
m_pro_ct0->h_w(BIT(offset, 2));
u8 gad = m_pro_ct0->gad_r();
u8 gbd = m_pro_ct0->gbd_r();
- return (BIT(gbd, 0, 2) << 6) | (BIT(gbd, 2, 2) << 4) | (BIT(gad, 0, 2) << 6) | (BIT(gad, 2, 2) << 4);
+ /*
+ Data pin from PRO-CT0
+ D0 D1 D2 D3 D4 D5 D6 D7
+ GAD2 GAD3 GAD0 GAD1 GBD2 GBD3 GBD0 GBD1
+ */
+ return (BIT(gbd, 0, 2) << 6) | (BIT(gbd, 2, 2) << 4) | (BIT(gad, 0, 2) << 2) | (BIT(gad, 2, 2) << 0);
}
@@ -55,8 +60,13 @@ void fatfury2_prot_device::protection_w(offs_t offset, uint16_t data)
m_pro_ct0->h_w(BIT(offset, 2)); // A3
// C16-31 = A4-A19, C0-C15 = D0-D15
- m_pro_ct0->c_w((u32(bitswap<16>(BIT(offset, 3, 16), 15, 13, 11, 9, 14, 12, 10, 8, 7, 5, 3, 1, 6, 4, 2, 0)) << 16) |
- bitswap<16>(data, 15, 13, 11, 9, 14, 12, 10, 8, 7, 5, 3, 1, 6, 4, 2, 0));
+ /*
+ Address/Data pin mapping into PRO-CT0
+ C0 C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 C21 C22 C23 C24 C25 C26 C27 C28 C29 C30 C31 LOAD EVEN H
+ D0 D4 D1 D5 D2 D6 D3 D7 D8 D12 D9 D13 D10 D14 D11 D15 A4 A8 A5 A9 A6 A10 A7 A11 A12 A16 A13 A17 A14 A18 A15 A19 A1 A2 A3
+ */
+ m_pro_ct0->c_w((u32(bitswap<16>(BIT(offset, 3, 16), 15, 11, 14, 10, 13, 9, 12, 8, 7, 3, 6, 2, 5, 1, 4, 0)) << 16) |
+ u32(bitswap<16>(data, 15, 11, 14, 10, 13, 9, 12, 8, 7, 3, 6, 2, 5, 1, 4, 0)));
// release /PORTOEL
m_pro_ct0->clk_w(false);